do you think micro job poster site should restrict on their lsiting

I think so.Perhaps you are not a member of any micro job site.Perhaps some of you are aware of that and often takes job from them.I am a member of few sites like simpleworkers.com,jobboy.com,microworker.com .There I have notice many job listing about clicking on ads.They are too much innocent and thinks that Google couldn't able to know about them,but I am sure they will be caught any day.But what about you,if you are taking those job for few cents.

I think job listing site should restrict on this type of listing.They are cheating us ,cheating advertiser and Google too.What you think about it?