Both but generally from clicks.
You don't have to click on purpose, as much as I appreciate the offer. It's against the Google ad terms of service. But, yeah, if you see something that truly interests you of course click through.
Hopefully soon when I get the music based ads going it won't be an issue. The google ads are SUPPOSED to target ads by looking at keywords on the page. Obviously it ain't workin'! I'm sick of the IMVU and dating crap.