It's literally impossible to lack meseta to buy a brissa set. You get so much from the mission badges that are worth a good bit in the shop. But oh players can't get a shop? We get 10* weapons all the time to dump into excubes. But wait, where are people getting the meseta to have a nox weapon to use already? The cafe's weeklies.
I didn't know most players knew how to do all this perfectly.