10% market fees say what?
720,000,000 * 0.9 = 648,000,000
Oh, look, a wild 72,000,000 inf* sink just appeared! Quick, someone take a picture!
And the inf* being spent for those stacks of prismatics, that's not being created out of thin air either. That's pre-existing inf* that people have had sitting in storage, tucked away in bids on non-existent items in the market. The inf* they're throwing at the AH now is just changing hands. The people with less inf* get more, inflation has a lower chance of taking hold since so much inf* is being destroyed, win-win for everyone.
Or are you really going to try to argue that people are emergency farming billions of inf* in a few hours to buy stacks of prismatics? I hope not, because no-one's going to buy that bullshit, even if they're willing to pay early adopter prices for prismatics, especially after you pointed out that they can't farm that much, that quickly.
Kind of shot yourself in the foot there, didn't you.