Rich:
We do something like you're talking about, but we charge for search engine placement.
$20 for each agreed upon search term on the first page of the top 4 search engines, and $35 for anything in the top 5. With a monthly agreed upon cap, depending on the competitiveness of the keywords... which can range from $99 to $999 a month. This seems to have been working well for those aggressive agents that want us to do everything, and they just follow the leads.
Charging for results in being on the front page and top 5 in the 4 major search engines seems to work. If you're there, you get the traffic, there's just no doubt. Now once we tried to base our rate on "solid leads" but that was too hard to define. Then we tried to base or rate on closing, but that was even harder to track and the agent didn't seem to work the leads very hard. If it was an easy sale, yes, but since the lead didn't "cost" him anything, there wasn't a sense of loss.
So if you still are thinking of pursuing this thought, pay by position seems to work for us, and the Realtors that join our "Platinum" membership.
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Greg Mazurek
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Orange County Real Estate info and online Orange County MLS Search.