Cuz I'm in it.
Just to give you a little backround so you know I'm not blowing steam. I run 16 seperate PPC campaigns on close to 50 websites.
That's almost 800 different accounts in slave years. On average they have 3-10 thousand keywords each.
I spend 15+ hours per week analyzing logs, emailing the same companies about the same sh**, and playing email tag while these companies give and take funds on my companies credit cards like its monopoly money...legally.
Just in case your not privy to PPC/CPC/CPV/CPA or the rest, here's a perfect example...
(Remember, this is 1 account out of 800+)
BrainFox sent us a wonderful 800 non-US click-throughs on this peticular account. Useless to us, despite the fact I had the appropriate filters on. I busted them ,after a tedious log analysis, for 98% of my billables, during a 10 hr. period. (btw: 0 conversions)
They admitted fault (after emailing them my very detailed log file analysis),and credited my account 100%. Cool.
I posted a new campaign and had it on pause (6000 Keywords) and they activated it when the redeposited the funds.
The next day their logs showed 8000 click throughs, mine (with is cookie based), showed 1407.
Sorry to run on here, but I'm sick of answering these questions for corporate.
Last year Click Fraud (tracked click fraud...mind you) was at 16%. I have several very detailed reports showing it statistically at 30% right now, and feedback from merchants and other reports report that a majority speculate 45% and higher.
I have 6 accounts (90 campaigns) that show higher fraud traffic than genuine traffic...and a couple above 75%
GOOGLE, Overture/Yahoo, LookSmart, Miva, Lycos, SearchFeed, Search123, Kanoodle, Mamma, Turbo10, Xappa, and a dozen of you other 2-3 tier sites, learn to police your traffic better.
90 million is a grain of sand to google. It's a BONE.
Someone needs to do something. Maybe I'll start something...