Doesn't seem a great idea. Both the freelancer and the customer have to trust you with the job. And after a couple of weeks/days you will never see them again. As a customer I wouldn't accept that. Besides, wouldn't it be easier for you to score your own assignments?
What do you mean "after a couple of days you will never see them again"? To be completely honest, we're not-so-great at finding new work. Word of mouth is about all we've had any luck with. So we thought this a new and interesting idea on how to drum up contacts and work. Maybe it will be good, maybe not. But we're giving it a try.
It's cool that you're honest with your marketing/sales problem and try it with this idea!
I wish you luck, I/We have the same problems with marketing/sales. If you figured out some learnings, would be great to read on your blog!