There's often no rhyme or reason why a particular site is picked, I think it's just random bots and kiddies that do it just because they can. I used to admin several gaming forums and it was a constant battle. I finally saved my sanity by blocking 5 countries entirely where the majority of hits were coming from, and if we got a member from any of those locations, I could easily unblock their IP range. That's not something you could do here since there are members from every corner of the world. But it's a never ending battle that requires a lot of time. It's really appreciated that you keep the site working for us to enjoy.