Visit this page (nothing special, just the first search result for "software engineer salary"):

http://www.payscale.com/research/US/Job=Software_Engineer_/_...

And ask yourself this question: If these two people can't make more than $50k per year per capita in software consulting, in this market, in their product's alleged target market - and they can't figure out how to grow that number more than 15% per year, via simple recipes that are orders of magnitude less risky than developing and shipping a product - why on earth are you quitting a job to partner with them?

Look for partners who can find a market worth finding. In the meantime, don't give up your day job, no matter how much equity you're offered.