It's unclear if any devices have sold,
though there are a few bids in the running.
Maybe wait a day or two before pulling the trigger, though;
some say this is all a huge publicity stunt and the app will be back up soon, while others say the developer is avoiding being sued by other game makers.
You could also check out Flappy Bird clones such as Ironpants.
It's free; it offers similar gameplay, if you can live without the bird character; and it doesn't require remembering your eBay password.