But you must also take the servers into account, anyways I'm planning to get one anyways so I need that yearly vip,
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Along those lines, you can have people pay if they want to play on GK, private servers, or classic, sort of like VIP but if you would want to play on Gold server, you could do an upgrade.
You could have the people with time on their account post in forum, and classics play on classic servers.
But then I guess they would have to cut the time in half to be able to afford a switch like this.