Web site "rate it" templates are easy to find. Put one up and gear it toward individuals/companies that make web site templates. Great promotional tool. Sooner or later, a web site owner selling web site templates will want it to get control of a potential competitor.
Domain only is low, but a simple development raises the value fast.
$40/$80 domain wholesale/retail
$500 and up - quick development
However, I recall many template whores have PHP web sites that allow ratings for each entry. FreeLayouts.com is a good example.
Also, it's very obvious many template sellers use "trojan marketing" (make ad/site look like info/game, aimed to sell). Your domain name has that appeal.