Well it would be nice if you could whitelist sites you think are worth the clicks. So, sites you like get a lot more click revenue, because you clicked every ad

Well it would be nice if you could whitelist sites you think are worth the clicks. So, sites you like get a lot more click revenue, because you clicked every add. While the desired effect of diluting PPC would be reduced, you wouldn't be giving revenue to sites that you don't think are worth it.