Elance would deliver in shorter turnaround on 1/10th of that amount (or even lesser). I am not trying to spoil your idea but this is the reality. If you can surmount that possible hurdle, then your idea might just be great. But until then...
Yeah, that is a serious concern. Its hard to compete with people who can live for a week on what I need in a day.
But you know that, on the right market, many companies are willing to pay $1,000 for that kind of service. I'm sure there is a market for such service.