Well, common sense prevails. Say you manage a trading desk. You have five index traders. Your Russell, your Nasdaq, your Dow, your FTSE traders are each up $XYZ. They've been managing both long and short positions on a swing trading basis - taking losses and letting winners run a bit. Let's say the Portfolio Manager pays out a six month bonus to his Desk Managers. Do you honestly think that that Desk Manager is going to let ONE jackass keep adding to a losing position that's been largely underwater since February ? Fuck NO. gone baby gone. The Risk Manager and the PM wouldn't stand for it either. No way that they let ONE guy piss away their year. Not only that, this one compounded position starts to really impact firm margin and risk metrics on a disproportionate basis.
Does not happen.
It's possible that the majority HEAD of a fund might make a highly directional, levered bet provided that he's got a iron-clad gate on customer funds. But unless he's right without much in the way of pain he'll lose most all of those clients once they are able to withdraw - even if the bet was highly profitable.
Investors and Fund Managers are incredibly risk averse quite frankly. More so than many retailers would imagine.