That's what I just don't get. He is a billionaire. Why go on a crusade that could bankrupt you (because of a rally or because of lawsuits)? And then pledge to give all money to charity. Makes no sense at all.
the most he could get out of this position is for HLF to go to zero. The most longs could get is for HLF to become a giant as big as ebay, etc. So we could potentially become 8 fold or more. To sell his thesis and invite more sellers he needs to say HLF would go to 0