yes, their site, their rules, and I agree with you both, Anon and Idol, but I understand it's not easy to "know" who's who on the web =/
That's why I think they would call it "security mesures"... It's probably not fair to most of us but they will say it's safe to say the least. After being "cheated/deceived" by others, I just can't blame them.
Bookmarks