I mean no offense when I say this, but you're a great example of a "smart but clueless" employee dishonest startup founders prey on. At $500/week, you are making $26,000/year. Assuming you're a good developer (and now manager), you could probably pull in $120,000 working for Google or Facebook, which means you're losing $94,000/year (!) in opportunity cost (not even counting health benefits or other minor perks). You said nothing about equity, but assuming you will own 1% of the company after four years, and assuming the company exits for $50mil, your equity will be worth $500k, while you could have earned $376k working a stable job (again not counting health insurance, plus Facebook gives equity too). Considering that a potential exit opportunity is associated with large risk, the expected value of working for such a startup is miniscule, compared to opportunity cost.
You are not acting to your own advantage financially or emotionally. One option you have is to renegotiate your salary with the founder, and considering how hard it is to find great people, and how little he pays you, I have a strong feeling he'll budge. But if you have options (and it's your market now), do you really want to work for someone who has no ethical standards?
BTW, we're hiring: www.rethinkdb.com/jobs.
EDIT: just read your comment that you do not have any equity. Run, don't walk.