Interesting! Would you do some kind of "Quality assurance" of the services providers? How do you make sure they keep paying you once you find someone? Maybe some kind of rating based on number of tasks completed?
I'm currently working on adding in a rating system. The back-end is set up in such a way that your credit card is authorized when you make a task, and charged when you hit "Confirm Task". If your task is accepted and its been 5 days and you haven't hit confirm or dispute, it automatically charges the card.