I wish that were true, but the problem seems to be growing. Every PPC engine has fraud. The best have the least, but the worst are still in business with no signs of stopping.
It’s true that Google and Overture, who are better about fraud detection, get the big money clicks, but the others are still making money, bringing on more traffic sources and more uninformed advertisers every day. I’d love to see some of the engines floating belly up, but it hasn’t happened yet, and it’s been happening for years.