Well, if you really want to know how much people will pay, then auction it off. Post it on eBay and put a link here. If you don't want to let go of it for under $X, then make $X the minimum bid or (though I don't like the practice) make $X the reserve price. You'll pay a commission, but you may get a higher price.
People have done that on this forum -- I don't think it's out of bounds at all.
We do seem to prefer the usual approach, though. It's much lower pressure.