I upvoted you but after thinking about it actually, you will find that this will attract kids that are friends for the money and start weird dynamics in the social bubble of his son. But your idea is right! Maybe he could have done gaming sessions at his house or who knows what to better spend this money on other games.
Yah, but Roblox weird money dynamics is that he's showing up and is overpowered in the games because he's paying to win, but fellow kids likely view him as exceptionally skilled :P