|Be careful when buying DOC's that you get the proper voltage. If the part number ends in -V3 (or similar), then it is a 3.3v part. All of the i-Appliances, SBC's, etc. that I've worked on use the 5v part. These don't have the "-V3" appendage to the part number.|
It is a pretty safe guess that putting a 3.3v part in a 5v socket will have the same effect as installing the chip backwards. That is, you end up with a useless trinket suitable for making into a keychain <g>.
The 3.3v parts have been selling for very low prices on eBay. I imagine that the few that have sold have gone either a very happy buyer that got a great deal, or a very sad buyer that bought something they couldn't use.
Electronics run on smoke, if you let the smoke out they won't work