Why would you spend that much money to crash the network... only to lose the entire amount of your money? Also, knowledge about short-sells would help to stabi

Why would you spend that much money to crash the network... only to lose the entire amount of your money? Also, knowledge about short-sells would help to stabilize the currency's value, NOT crash it. Just like it has for all other assets out there. A 51% attack would cost far more than 150 million at this point.