Why not... (Score 1)

If spammers are so good at subverting systems meant to prove humaneness(i.e. problems that are easy for the human mind but hard for computers), why not use this for some societal advantage... build complex problems from programing and cognitive-science into puzzle problems, wait for the spammers to work it out, and then buy (or better yet, just take) their methods from them. Visual recognition of objects, faces, labeling of sounds, identifying objects, etc. etc. etc.