Ah, the future value of equity ... sacrifice your life on spec that the venture will succeed when most don't and that your boss won't find a way to fuck you over of it does. Bearing in mind that the more money is on the table, the more likely it is that your boss will try to screw you out of it.
If you want to go to Vegas, go to Vegas. Do an 80-hour stint, see if you get rich, and if you fail then go home. Don't spend years at some shitty company run by an asshole.