You are of course technically correct.Nope, the model payout is the same, but the percentage changes. If I pay $0.08 per token and the model gets $0.05 per token that model is getting 62.5% of my money.
But for the purposes of this discussion, that fact is irrelevant. A model doesn't / can't know that percentage. And indeed shouldn't be bothering themselves with such minutiae. Should they treat you differently because they get 62.5% of your money but only 50% of mine? Of course not, all that matters, practically, is that they get US$0.05 per each of our tips.
And to throw another factor into the equation (also irrelevant and purely for discussion purposes here), because I have to buy in USD but live in Australia and our dollar always sucks in the exchange rate, even on the larger token packages each token actually costs me approx 12 cents Australian. So to look at model's payouts from user purchase perspective is pointless and (again) irrelevant .