What's your view on Token that has value appreciate by burning?

Hello guys, i am sure you have seen before tons of business models in ICO where they changed from profit sharing/revenue sharing to Buy back and Burn model.

Most of them do this to prevent issue like SEC, Regulatory and etc.

However, does buy back really provide that "Value" compare to Revenue sharing?

Revenue sharing is lifetime where as long as the business runs, you will get a profit from it.

But, for Buy Back and Burned. Aside from burning the supply to reduce the supply so that the demand can be more than the supply. However, i still don't get at this point.

If the token itself get its value by Buy back with profits and Burn, what happens when all the tokens is burned out? (It may sound impossible but lets say if it happens), lets say we are left with 1 Token?

What should be the valuation there for the last 1 Token?
The only use case for it is to be burned?

Need some help here