On Roblox there is not ability to sell most user created content, except for catalog items. I think if this were to change it would greatly benefit the community as well as developers. Being able to sell your created items would encourage higher quality products as there would be a motivation to create them. This could also be a small source of income for developers as well.
Almost all other game engines have the ability to sell your creations even the open source free Godot engine allows this. The Roblox website already has a “Sell this product” check box but you arent really selling it if it is always free. I know from personal experience that if I was able to sell plugins, scripts, animations, etc then I would be far more encouraged to continue updating those products, as well as create higher quality products. Not to mention Roblox would almost only gain from this being a feature.
Thank you and I would like to hear feedback below because there has to be a reason as to why this isnt a thing yet. Ive been on Roblox since 2011 and as far as I know no one has mentioned this.