I’ve seen with Insource (another product selling hub bot thing) that they allow a server to lock certain products until a user purchases a different product first.
So if I’ll selling a custom imported Ford F150 and I’m also selling that same car but with scripted ELS.
I can sell the base for let’s say 300 robux and the ELS version for 25, but in order to buy the ELS version they have to buy the base version first.
Sort of like buying DLC(the ELS version) for the base game(base version). You can’t buy/use the DLC until you buy the main part of the game.