Who hasn't, as they've clicked that oh-so-tempting buy it now button on eBay, Amazon or Etsy thought, "I should be selling, instead of buying?" Yes, you could actually make money online rather than just spend it -- what a concept.
I'm definitely in that category, especially when it comes to dresses. I can justify my buys with the fact I work on camera a lot and therefore "need" a variety of clothing (but really... that's a pretty weak excuse. I just love clothes!) In order to salve my guilt (or is it simple to free more space in my closet?) I've decided to put my mod-mini where my mouth is and open a vintage frock shoppe on Etsy.