I think I've done that in a few games, but only so that I can be in an environment where I can make the very best move and not rush it. this is an example, I took a long time on this game but i came out ahead
http://www.chess.com/echess/game.html?id=18171641
EDIT: of course if im completely lost then I resign, but I thought I had a possible attack in exchange for the piece
I dont mind what he does if I am winning
and ultimately i agree. winning the game and playing well is very important but the other stuff has some effect.