I like it.
For the economic model you could think about the price of the game and the subscription to your server as a seperate thing, like making the possibility for the player to create their server (local host or wathever), this way I would personnaly enjoy it, as I have to admite that I prefer to have a game that will not disappear some month later due to none profit (pardon the bad english). Just my opinion, a hint nothing more, not to take seriously.
yhann
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