It would be nice to have lifetime BC, TBC, or OBC, but I understand it would not make as much of a profit. Still, it would be pretty cool. It would make me want to buy BC more than I normally would.
It used to be a thing but ROBLOX wants more money, so whoever did pay for it in the past have it until they decide to cancel it. I doubt they'll ad it back but I'll support, I want it back.