So do I give an upvote if I like the ad, if I approve of it, or if I'm actually likely to follow up on it with a purchase? An ad could easily be one of those and not the other two, and I don't want to send mixed messages to advertisers. Of course, I use adblock and flashblock on most sites (a few sites I do allow ads), but if this caught on enough to convince advertisers to stop using crappy / annoying ads, maybe that would change.
As the people commenting at fw's blog say, it just isn't going to work. It's also been done quite a few times.
Maybe if you tried a "fun" twist instead, like a link that says, "Don't bother other people with this ad". Make it explicit, you know.
BTW, I'm a consumer of web ads, and my ctr with adwords is usually between 2-3 percent. (For certain keywords, as high as 50 percent.) My adsense ctr? For this month... 0.02 percent. One click total. So, there's definitely room for improvement.
