I hate to say it but $2,000 sounds a bit cheap. I'm assuming that most people who want to "code an idea" aren't looking for a WordPress install but something that's a bit more grand and may require doing a spec. If a coder is $50 an hour $2,000 is just 40 hours (i.e. one week): In my experience you'll spend at least that doing bug fixes and QA (even on a small project).

Maybe you should even set the minimum at $5k? If you're not willing to spend $5k on your idea then it can't be a very good idea if you know what I mean. And I say this as a designer who isn't a coder...