But they don't want that because they do not believe that their own token will have value or demand when it hit the market

and that's actually what's happening
That's one of the reasons I can think of if you have more post it here.
If they don't believe that the token's project that they are advertising and managing as a bounty or campaign will have value, then why they're keeping their task and staying to manage it?
Let's start with the fact that the bounty manager is the same person as a member of the company's bounty, as he also receives payment in project tokens and doesnt really depend on him and the project is of course more profitable to give his token as they can manipulate the course in the future.
Mostly they are receiving payment in tokens too but a reputable one would choose the best payment method and can demand his preferred crypto as means of payment.