I know we all love finding out where the best massages joints in the Indian subcontinent are but hear me out.
Sure spammers have to solve captchas until they get a high enough score, but what if they had to solve even more? For example, if your score is between between -1 and -5 you have to solve two to make a submission. If it is between -6 and -10 you have to solve three, and so on. It seems like a good way to keep the mechanical turks busy instead of wasting our time reading about dubious health benefits.
At the moment, that's kind of pointless. Account creation is easier than submitting multiple captchas to make one more post.