Whether the payback time of the project was calculated, and how long it would take to make a profit if you redeem the tokens back.

it's quite interesting. The company is going to buy the tokens back?

I have not heard anything about it. I think the company can buy tokens on the exchange like everyone else.

Many ICO buy tokens back. They use for this part of there profit.

I also heard about it. Many companies reduce the price of the token so that they can then redeem the tokens back

Each owner must have his or her own business tactics. If you bought tokens, you only decide what to do with them.