An EnerVest fund that started with TWO BILLION dolalrs is not practically worthless. Okay, that can happen - but based on comments by the company their investors aren't who they care about, it's the bank! They want to keep Wells Fargo as happy as possible so they can borrow more to do it all again later...

http://www.upstreamonline.com/live/1309888/enervest-energy-fund-loses-nearly-all-value

http://www.foxbusiness.com/features/2017/07/17/from-2-billion-to-zero-private-equity-fund-goes-bust-in-oil-patch.html