My 9 year old brother plays Roblox and discusses the trade values of pets in the games Bubblegum Simulator and Adopt Me on Fandom all the time, but doesn't spen

My 9 year old brother plays Roblox and discusses the trade values of pets in the games Bubblegum Simulator and Adopt Me on Fandom all the time, but doesn't spend actual money on any microtransactions in the game. Still, I'm surprised to see that there are people that will charge and pay huge amounts of money for rare digital pets in the game.