Marc Cuban appears interested in hyping up anything which will profit him. Ticket sales on the blockchain don't really address any of those problems. You still have a central authority (the issuer of the ticket) who determines whether they want to let you in. You still need to check with the issuer whether the token you're buying is valid (which is easily done with serial numbers on non-blockchain tickets). You can avoid sending a portion of revenue back to the source by selling a token off-chain (maybe even for cash!). If venues want to discourage inflation, they should make it easier and cheaper to return unwanted tickets. Or they and fans can accept that the price of tickets is artificially low and only rich people can afford them. Basically, all of the problems of, say, ticket sales can be solved culturally and with a central database. A ledger adds nothing but environmental pain. I've spent years looking into this and I haven't yet found a DLT which has a real world use.