In September 2021, Roblox added a refund policy, which allows users to get refunds for Robux.
The player can then choose to either purchase the membership or not enter the area, but if they like your game then chances are they will upgrade.
But you will get nothing out of it.
Premium subscribers can list their limited items and for sale.
Example of buying furniture for a player's house in by alexnewtron.
Memes based on a virtual currency typically mock Robux as well as other in-game currencies, such as 's.