Swinger's causion should be taken into full consideration. Displaying Adsense along with competing Ads is against Adsense TOS. Google catche is a bot activity which may be why you have not received a warning mail as I did on other aspects of TOS violation.
Personally, I am very careful because my account is quite substnacial, and because I have once nearly had it banned as follows:
"Hello Jackson,
It has come to our attention that invalid clicks or impressions have
been generated on the Google ads on your site(s) through users of
third-party programs paid or provided with other incentives to visit
your site. Such programs may include, but are not limited to auto-surf,
pay-to-surf, pay-to-read, or pay-to-click sites.
As a reminder, any method of generating invalid clicks or impressions
is strictly prohibited by our Terms & Conditions and program policies:
https://www.google.com/adsense/localized-terms?hl=en_US
https://www.google.com/adsense/policies?hl=en_US
If we continue to detect invalid clicks or impressions from these
services on your ads, we may disable your account to protect our
advertisers.
Sincerely,
The Google AdSense Team"
Grow your Adsense ethically, don't get Google banned for some small advantages you can't even count on.
