Google, Hotmail, Yahoo and there are lot of Internet companies that spend millions of dollars for Image “CAPTCHAS” to stop automatic registration on their websites. Xrumer is a tool commonly used to automate registration a countless numbers of forums. With the latest version of Xrumer (5.0A) spammers can automate the process of registration on websites like Hotmail and Gmail. Xrumer (5.0A) is capable of cracking some of the most difficult CAPTCHAS.
Any Internet spammer who want to spread or automate the registration process can easily purchase a copy of Xrumer for about $520 from botmaster.net.
Instead of using CAPTCHAS in registration process i think asking simple mathematical or environmental questions can be a good solution instead of wasting a good amount of money in CAPTCHAS.