But, according to former Costco marketing manager and Quora user Dan Holliday, that doesn't mean that you should.
In a 2013 post, he wrote that Costco Travel deals aren't "terrible" by any means. Still, he wrote that, "you're simply not going to find some crazier deal on Costco Travel than you would anywhere else."
He wrote that, like with any travel site, there's a possibility you'll find a gem of a vacation package.
"If you're just booking airfare or hotels, then don't bother," Holliday wrote. "There are better sites."
Standard membership if you spend a ton of money
A standard membership at Costco goes for $60 a year. An executive membership will cost you $120 a year.
"Similarly they also carry large patio furniture sets, but nobody here has a yard or patio big enough for them," he wrote. "For almost everything else, I'm at Costco every couple of weeks!"
Lots of perishables
Is buying large quantities of perishable vegetables and fruit worth it at Costco?
The answer pretty much depends on your circumstances in life.
On Quora, Falletta wrote that you should take the size of your household into consideration.
"If it's just you and your partner, Costco's packages of produce and fresh foods may be too much for you to buy regularly," he wrote. "If the food that you're buying is going bad before you get to it, then obviously there's an issue."
In a Quora post, Falletta wrote that, while the warehouse is the best spot to buy most items, you should consider buying electronics elsewhere. And that's only because of the advent of the internet.
"With internet shopping being what it is today, there are an unbelievable amount of hot deals going on at any given time in every major category of electronics," he wrote. "On a day to day basis, I stand by the statement that no one will beat Costco's price in a direct comparison, but for electronics, I will allow that one might get lucky to the tune of a few bucks here or there."
Any product where you're buying more than you need
It can be easy to get caught up in the Costco shopping experience and come away with more items than you'd intended to buy.
Costco member and Quora user Betsy Megas wrote that, because of the warehouse's bulk sizes, it's "easy to buy far more of something than one household needs and can use."
And regardless of what the product is, it's a waste of money if you don't end up using it at all.
"If you're going to buy something, make sure you'll get the right amount of use out of it, otherwise that all-important value will be lost on you, and this whole argument will be moot," Falletta wrote on Quora.
Towels and sheets, if you're picky about color
If you roll up to Costco expecting to find the perfect shade of periwinkle, you're probably going to be disappointed.
"If you want 20 colors, this isn't the place," Costco merchandise manager Jim Klauer told CNBC.
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Costco employees know firsthand that it's sometimes better to look for deals elsewhere, especially when it comes to certain items.
Here's a look at some items you might want to consider skipping on your next Costco run, according to employees.
RELATED: Costco food court secrets revealed:
Shocking Costco food court secrets
Shocking Costco food court secrets
The most popular item on the menu? The legendary Costco hot dog.
"There's something about a buck fifty that people really love," said the employee.
But at 552 calories and 32 g of fat, you may want save this food court staple for special occasions.
Another discontinued item that Costco often receives questions about? The chocolate-dipped ice cream bar with almonds. We hate to break it to you, but it's probably never coming back.
"I think it might have been too expensive for the amount we give. That's what happened with gelato anyway," the employee said.
Everyone knows that the best churro is one that is hot and freshly made. If customers don't think they're getting the best churro their money can buy, don't be afraid to ask for a new one!
The employee said, "I learn to check when we're running low on churros and wait for a new pan to come out," adding, "I recommend checking on them right before you shop and seeing the changes when you come back. My favorite is when they run out of churros and you wait for five minutes or so, then when they pull them off the pan, it is a hundred percent brand new."
The beloved berry smoothie was recently replaced by a different fruit smoothie -- and there's a perfectly logical (and healthy!) explanation for it.
"Corporate thought the benefits outweighed the negatives in this situation. The new smoothie has a lot of better benefits in it -- less sugar, less calories, nothing but real fruit and fruit juice, and four servings of fruit in each smoothie." the employee said.
Have you ever found yourself blotting away all the excess oil on your incredibly cheesy Costco pizza? There's a reason for that.
The anonymous employee revealed that the amount of oil used in making the pizza is "too much." In fact, upper management monitors employees to make sure they're using enough oil.
"When you don't use the corporate requested amount because you think it's too much and corporate notices? You use more oil to avoid being in trouble. Some managers overcompensate and use a quarter cup of oil+ when making them."
Yikes! Talk about a heart attack on a plate.
And of course we're dying to know what the pizza is made out of!
"It's made with love," the employee jokingly said.
Another Reddit user who claims to be a former employee also chimed in: "I don't know what's in the sauce, it came to us prepared, as did the cheese mix . . . I know it was like 85 percent mozzarella and 15 percent provolone when I worked there."
There's no denying that Costco's chicken bake has a massive cult following. Surprisingly, the food court hit is pretty simple to make! After flattening out a lot of pizza dough, employees mix in chicken breast strips, mozzarella cheese, bacon and caesar dressing. All these ingredients are rolled up into the dough.
And if you prefer no bacon in your chicken bake, you'll have to come in earlier in the day when employees are making it.
"Sometimes the employees are running little bit late and they'll make them during the day, but you'd have to catch them before they mix the cheese and bacon. Which is hard to do," the employee said. "You could always call ahead a day and ask. I'm sure they'd oblige."
Surprisingly, employees don't get a discount at the food court. However, they do receive a free executive membership ($120 a year), which is also a pretty impressive perk!