Just because others are doing it doesn’t make it right. The risk with clothing with logos is that if your game gets taken down, it means your clothes will go with it. If the clothes are content deleted as well, you’ll have an angry mob of angry customers coming at you demanding refunds. You should really thing if you really want that to happen.
You’re overthinking the amount of profits clothing groups can make. They don’t make as much as you think they do, and most players that join your game from an ad will leave within a few seconds since homestores don’t interest most players. There’s some people that are obsessed with clothing, but most just play the real games on Roblox.
You should maybe spend 5k tonight, since it is your first time. After this 5k is spent and the ads end, you can go look at how much you lost or profited. If you didn’t earn over 5k back, then you need to go back and improve your clothing. If you earned more than 5k back, then you can maybe spend 15k tomorrow.