The problem is that buying QI feels like cheating the system. Its fine to buy TC, however giving the option to buy "experience" or QI is just weird.
That's the reason there are different levels of rooms (Ultimate, Blackbelt, Intermediate...)
And if it's for items they can just buy TC and get the No-QI Items instead.
I don't see how it can be frowned upon. I mean like. What possible advantage would i have because i have a higher belt then you? After 3rd dan black belt, belts literally mean nothing ( Other than the items you can buy, Which you can purchase with no qi. ) Also belt has nothing to do with someones skill level, nor does it even remotely reflect someones "skill" level.