I would also prefer to have a bounty token distribution after some use of these tokens. Bounty participants are selling only because they do not see any progress or use of received tokens.

A lot of bounty hunters that are doing this for a living dont really care if they the project shows progress or not. They are selling their tokens as soon as possible and don't look back. That's why bounty hunters are said to cause the price to dump when the bounty share is too big.
This is true but so are most investors in the project, they just want invest and flip their profit into the next big thing. The issue here is that some people feel that once you are bounty hunter that shows you have not stake in the project, some hunters do invest in most of the project their participated in, for me I don't support project I can't invest into.