Startup Idea : Crowdsource Wedding Vendors

Basically, taking the idea from this community ideaswatch, but for wedding. It's intended for couples who would like to get a wedding but have financial limitation. So the couples (or one of them) would set the budget they're willing to spend for each vendor and vendors can accept the work for the budget they specified. You would ask, what's in it for the vendors? The vendors are intended for amateurs to get more portfolio or to get the words of mouth out. So it's really benefiting both parties in a sense. Any thoughts?