Well there are plenty of forums that cover ppc stuff and I am looking into finding a thread on one of them that has more than "we took into consideration fraud clicks when we did our ROI" from a host. If you do a search for overture at webhostingtalk.com it'll give you plenty of chit chat and info on sports clicking etc.
How's this for pay per click though? nothing under 25 for the whole Top5!
http://overture.com/d/search/?type=h...s=mesothelioma
Ok found a thread on it where the owner of Rackshack comments on why they don't mind the click costs, basically due to Yahoo listing included for top 3 it's cheaper than advertising on yahoo. His comments are o nthe second page
http://www.webhostingtalk.com/showth...threadid=60672
Also to add fuel to the fire there's a site prompting people to sports click on spam terms to cost spammers money
http://spambattle.com/