Hedge funds managers are paid based on a percentage of the profits made for their investors. Usually there is also a "high water mark", and they won't be paid a performance fee until they return a profit greater than a certain percentage. A typical structure is 1.5%-2% of the NAV for management fees, and a performance fee of 15-20% of profit.
Many hedge funds also have clauses that if they have a loss, they have to pay the investors the loss, or will have it deducted from when they actually do make a profit.
Hedge funds are also folding in this environment.