I think time and effort are no more valuable than money in my opinion. That's why you should study the project thoroughly before investing your time in the gift. Indeed, doing bounty is a kind of investment, because you spend your valuable time and effort for a few weeks or months usually
This is even more than an investment. Bounty is essentially an advertising company and thanks to the efforts of the project hunters get investors who find their project in the footsteps that leave behind bounty hunters.