I don't think that it is worth experimenting with this. Chances are Google is just slow to catch on. In any case, can you picture the guys who are paying Google for the click? I bet they are not too happy. I'd ignore it, no matter how tempting it is.
This is unethical AND illegal, and it's only a matter of time before google shuts them down and bans a whole slew of Adsense accounts. It'll be really easy for Google to find out if these are forced clicks, as I'm betting that the click-through ratio on these sites are going to be unnaturally high!