Ignored this thread for two weeks so had a lot to read. o.o
I think the new ranks are a great shout. However, to incorporate what Velo mentioned about admins still inviting players to rank, maybe players should only be able to get to Major, for example, by paying and from then on they must be invited by the admins? This means that richphags can only get so far and admins can recognise players who are more responsible, dedicated and powerful and invite them to become Colonels and Generals thereafter. Like velo said, players could still have to pay the fee after being invited for these top 2 ranks?
Everything else sounds quality.
I like, I like.