I feel just the same way. I was a reliable source of income for ChessCube, albeit a small one, because I only really want to play with opponents who are better than I am. So I was always bleeding cubits slowly. (Which was fine.) But these changes are absurd. And to not honor the free VIP memberships they've given out for number of games played is just wrong, maybe even illegal, since they made no distinction when they offered them.
The system won't even let me spend my 270 crowns on VIP any more! And I bought those crowns--didn't win them--it's like stealing not to honor them.
I will hoard my remaining stash of cubits, and when are gone, so am I. The "crowns" are clearly just useless now, so I'm not sure what I'll do with those.
Thanks for the especially cogent and well thought out post.