I have a question about the different tiers and maybe somebody can help.

So I made the most expensive purchase the other day. I bought an Amazing Fantasy #15 in what the seller says is around a 4.5. Anyways, I was going through the tiers for grading and the highest one I could find was the Premium. My only issue is that the max value is 3 grand for each comic. Is there another route I need to take?

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