[polemic]

The application owner gives up control to a secondary market for no gain. They'd do better to simply buy and sell directly, and maintain full pricing control. They already control scarcity, they don't need some other mechanism.

Meanwhile there is very little incentive for some other application to use those same tokens when their value is contingent on the whims of the original issuer. You're tightly coupling your business and liability to some other party who hasn't made any guarantees, promises or agreements to you. Its a can of legal problems.

Ultimately is like trading Apple gift cards, Pre-loaded debit cards, phone cards etc - its an abstraction in which then value of the token will only ever be less than the cash paid for it up-front, and most people trading them have some other reason for taking the hit (ie money laundering, fraud, etc)