[akadruid]

You've got the nail on the head. Capatcha publishing sites are already weeding out the idiots who will jump through hoops to join and blog comment argument or whatever it is - now they can sell the idiots to the highest bidder. Even if they get more spam, the idiot just earnt them cold hard cash in exchange for the spam, and you can still go back to solving spam the non-capatcha way.

It's evil, but evil in a kind of clinically beautiful way. I'd say it stands a good chance of working in the short term too - like punch they monkey ads made a lot of money for some people back in the day