Fencer: I've a simple rule on all game sites I play: I never accept invitations. If I want to play a particular game with particular time settings, I join a tournament according that suits my tastes, or pick one from the waiting games page. I might even create my own tournament or post something on the waiting games page. I certainly don't want to explain to people why I reject their invitations, so currently whenever I get invited, I put the person inviting me on my blocked users list, then decline the invitation.

I don't invite random strangers to play - and I appreciate it not to be invited either.