Welcome to performance cars. That tire wear is normal if you're always driving it to enjoy it. Also, the OEM tires suck for wear. You need to get something like a set of Michelin PSS or PS4S to replace them when they are fully worn out.
For reference, I have had 6 sets of tires on my Z in just about two years (17 days away in fact). I don't drive the car casually very much, and usually have less than 10k miles on a set of tires by the time they are dead, with the front and rear wearing evenly.
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