I expect it'll need to be higher than $1 because there's going to be some legal matters to deal with around paying the legally-minor creators any amount of money.
To be honest, when I think about it that way, you're not going to get that far under $1000 no matter what you do. There's tax forms at the very least, and probably extra stuff to do with dealing with minors, plus generalized legal risk of being sued or investigated anyhow... we need to be dealing with more than a few bucks here before it's worth Roblox's time & risk. Some of this is the cost of protecting minors, too.
