They will keep doing it until someone stops them.
Spending that kind of money for a political bash if you make several million a year is like you or me popping for an order of supersized fries.
And even then they'll be immediately looking for work arounds. The sad part too is their 'wealthy' and even NOT wealthy 'donors' continue to put up with it.
I wonder once Hillary doesn't make it to the presidency if their 'pay checks' will dry up considerably. Given that most people SEEM to rationalize this right now to get her in the white house, that motive will be no more after election day. The liberals will be working to get someone else in the white house soon following Trump's win with every dime they can muster I'm sure.