Just one more suggestion:
You could limit the inventory, you can buy. Many games limit the ingame purchases. Like you can get up to 20 additional inventory slots, if you want. If not, you use your qubits for other things (plots, resets, char slots). And later, if you want to, you buy inventory slots (per character).
So you give the rich ppl the ability, to support the game more. If not, you can buy something else.
But the best would be (in my opinion), if you add some (4 or 8) item slots for the gleam club, to give a little more advantages for support. I know, the gleam club is optional, but if you think about more and more players joining, which are not so kind like this community at the moment, why should they use the subscription? Less people cannot hold up the game in the future, for thousands of players. So you can make the gleam club a little bit more attractive?!
The advantages should not be oversized to sound unfair btw. But a single buy of game cannot solve the future financial situation of a company, to be honest.
Think about development, support, server, maintenances, promotion, lack of interest of players, … Many reasons you want to think about some reserves for example.
And by the way:
Everyone is complaining about the advantages and hate the gleam club instead just playing. Just do what you want, is this game a competetive game, or playing together? If it is a competition, think about, that it doesn’t matter how good you are, there is a asian anywhere who is farming (ming) faster then you could ever be #NoRacism #Joking