In our case, we became profitable. When all you need is money to pay for a small server and can get consulting gigs to pay for food, becoming profitable at two weeks (so far so good, anyway) really puts your mind at ease that what you're doing will at least hopefully be self-sustainable.

I realise this is useless advice for most other startups, but hey, spend as little as you can (but not too little), and you're doing the best you can.