heavenrose:
Fyi, some people found tricks to milk the Brain system for many thousands of brains, so he decided to not accept memberships paid from those 'cheat'-brains. With people continuing to play, that brain inflation is now spreading to many more players.
I'd guess if yours are honestly earned ones, you will probably get a membership for them. If you got them by tricking the system (or by winning against someone who got them tricking the system - you might not even know it), you might not. We'll see.