Lead Generation Idea : Please Tell Me How This Wouldn't Work

So, I had an idea for lead generation.

Step 1. Create and rank a generic website for a vertical in a town, such as 'www.findaplumbernewyork.com'

Step 2. Organic SEO the site for industry related keywords in the town, such as 'plumber new york' etc.

Step 3. Market the site to promote the following features :

- Visitors fill out a contact form with their plumbing needs, which is then emailed to 6-12 various plumbers in the New York area.

- The following benefits occur :

A. The visitor then gets to judge each specific plumbers reaction time to the inquiry, quoted price, general demeanor and various other benefits.

B. Each plumber who signs up to receive the inquiry is only charged for each email, somewhere in the price range of $5-$10 IE Pay-per-lead.

C. You, as the website provider, take lead payments from as many plumbers as you can sign up for the service, turning dozens of leads over per month for lots of money.

Can anyone spot issues/problems they see with this business model? It seems a very small tweak from what some people do already with Pay-per-lead.

I think it's more of a 'crowd sourcing' for quotes kind of idea, what do people think?

EDIT : Now that I think about it, it's kind of like creating PPC with email on your own websites. So the plumbers pay for each email from interested visitors.