As dakota mentioned, It depends I've heard of rumors of
freerolls with playmoney as a reward but most i've been in reward via direct money or tourney credits. But usually you need to place 1-10th in most i've played to see a chance of anything unless its a huge tourney. Check the tourney info if your not sure and usually the location of the tournament will tell you what you win if you win... I know
bodog has a popup that says if its for tourney creds or $$.