But I feel like every new fad has this. He spent all of his money on Pokemon cards years ago, that he never touches now.
What's amazing is how Roblox has made an actual marketplace and scarcity for virtual items that have no monetary backing.
They do have monetary backing[0]. The proceeds from item sales usually go to the item's creator - and if you have enough R$ you can convert it to USD.
[0] https://www.roblox.com/developer-exchange/help