This is exactly the reason that I turned down equity-only offers while I was freelancing after being on the down-and-out for a while. I was not in a financial situation where I could work for equity, I had bills to pay, and barely enough money to do so.

I eventually found a very good client with a very good idea, and am now working for a "pay the bills and save a little as well" salary + (a fair amount of) equity, which should work out really well - but before that, every offer for equity that I got was from someone that either couldn't afford to pay my bills while waiting for their idea to come to fruition, or just had a "ooh like a myspace/twitter mashup!!" flop of an idea.

If your idea is good, there are a lot of competent programmers who will work on it if you can keep a roof over their head and food in their stomach. Hell, I would live on someones couch or spare room (hence just food costs) while working on their idea if it was a really good one and I got along with them (I imagine I'm in the minority here).