Bounty managers usually will put a demand because managing a bounty campaign is a pain in the head. You're not only reviewing post in the forum but also with different kinds of social media platform advertising and you get to monitor them everyday. Any bounty manager would demand a 50-50 deal like 50% of payment will be btc and the other 50% is the company token.
I pity them actually, especially that most of the time they have 5k+ participants in social media, imagine how much they are spending their time just to check our output, then we will blame them for something that we should blame too, for sure they did their job to check the project if feasible or not, but it's not their fault if it is failed, so let's not blame them.
Asking for 50% fiat payment and 50% of their tokens is a good idea. But unfortunately every project cannot do that, most projects remain with their token allocation for the bounty program. And here I do not want to blame, but want something even better for BM and other participants. A good thing to do one BM is to ask for tokens in advance and use escrow as collateral.