The problem with bug bounties is they are one-sided, against the researcher. The conditions of bounties typically stipulate that any attempt at negotiation can be interpreted as extortion, so it is either take it or leave it.
The first case would get you likely in trouble. The second case would routinely cause a further review in any decent program, and if there's any merit to it, you get a higher bounty.
Nobody is forced to participate in any bug bounty program. If people feel the reward is too low, they should not partake.