I would be interested in hearing about your bad experience, Mercedes.
I've been having fun bidding on a few things...haven't won yet, though. I'm not seeing a lot of super deals, but a lot of things that seem OK for peak season to Europe...but definitely in excess of what I would pay off season.
I guess when it gets to within about 20% of the free market price, then I'd rather pay the extra than take my chances with SkyAuction.
Also, from what I've heard, a lot depends on the airline. I've read some nasty comments from people who bought UA tickets this way, but then fountd out there were only a small handful of available dates.
I guess the bottom line is that if you're gonna buy that way, you absolutely need to be informed ahead of time about what the market prices are.