I have just realised something. The CBS mentalist site has an add for whoisredjohn.com. If you have not realised what this means here are 2 possible theories why Bruno Heller made the site.

Theory 1 - He has not chose the character that will be reaveled to be Red John. So this means that maybe he is using the theories of this site to decide who he is going to turn into RJ not making the most expected character and avoid disapointments.

Theory 2 - To engage the community into this exciting search and not let them forget and lose their excitement.