You don't owe the community anything, man. You've given back a ton already.
If you want to sell it for a larger price than you paid, that is your prerogative and I don't think anyone will have a problem with it.
That said, I suspect you don't want to do that. Personally, if I had one and didn't want to keep it or sell it to the highest bidder, I would find one of those sad noobie WTB threads that never get fulfilled and sell it to him/her at cost.