Some people just participate in the bounties and wait for few years. they don't sell their bounty rewards for low fiat reward. Ironically those people become FIAT millionaires. 
Thx for bounties! Good jewelry.
Thx for bounties! Good jewelry.
That's actually wise for them. However, most of the bounty hunters are not doing that. By the time they receive their pay, they immediately dump them wherever the tokens are accepted for exchanges. They do not have the patience to hold their bounties and wait for quite a while for their tokens to accumulate value.
It really depends on the project. If the project is feasible and profitable in real life, then I think it's recommended to hold. These tokens are utility tokens than can be use as long as the project is there. And you can expect the price will go up.
If a reward token you have doesn't have these characteristics, then it's better to sell ASAP.