Yes. I did it once, sort of. I pulled something off auction early. Feeling nervous about sending the item, I went through a bunch of work to make sure the buyer was legit - that is just to make sure he even existed, had a good phone number, a good mailing address, etc. Turns out he did not, and to be honest I think it was a scam from the start.

I relisted the item of course, and ulitmately got more than I originally pulled it down for.

Only takes once to learn that lesson...

I don't even want to tell you how many requests you'd get if you put up something like a laptop, or a car. Scams by the dozen, it's incredible.