My current toy idea is a real-time captcha trading market. On the one hand, spammers might pay to use it. On the other hand, it will inspire websites to come

My current toy idea is a real-time captcha trading market. On the one hand, spammers might pay to use it. On the other hand, it will inspire websites to come up with something better than captchas. In any case, making a real-time market is too fun to worry about implications, don't you think? :)