Mabah

Like irl money? 

I mean Im not questioning the legitness of it. Im sure there is people who really want a certain username and will be willing to give money in return for the username.

Sounds like a lengthy process though. Gotta have the person name change so who knows how long ago that was hopefully the month is up. Then you gotta wait a month and like 7days to even claim the username. Which means you gotta pay attention to the availability. 

Ehh, all I had to do is change my username and get the money. It is not very common in Minecraft though. I have seen it done a lot with Consoles.