In 2006/2007 I ran three auctions to sell off some of my personal collection...I had moved into a smaller place and needed the room (not to mention the cash). My expectations were low, but I felt surely I could do better selling them to my customers directly when I would on Ebay.
The results of the auction astounded me and far surpassed any expectations. The (somewhat absurd) success of my personal auctions convinced me that there is great demand for older puzzles. Then I began receiving emails from people who wanted me to list some of their items in my next auction, convincing me that there were sellers out there as well.
Rather then act as a gatekeeper by continuing to run personal auctions, I felt it would be better for the community to establish a marketplace where the two could meet up on their own. While the exorbitant prices people have been paying at the private auctions is impressive, it really locks a lot of people out of participating.
Basicly this site is just like the private auctions, except open to anyone within the community. I think that with a level field like this marketplace, prices will come down in the long run. That's good for buyers, yet sellers will still get a fair price (much better then Ebay since the audience is so focused and the event is scheduled). The main point is not for anyone to get rich, but to facilitate a connection between collectors.