Because rgb nfts are slow and can't scale. If something scalable is desired, I'll look elsewhere. A promising idea is bespoke databases for particular purposes. Want ticket sales? Maintain a database of tickets and their owners, and erase it when your event is done. Something like that. That way you can sell the nfts over lightning (making them fast and scalable) and also control what happens with your tickets (which is a desirable feature for event creators).