Almost all projects see Bounty participants as a price dumper but this is not true. Bounty rewards are too low to affect market price at all. Although its agreeable that 80% of the participants try to sell coins the day they are awarded but it doesn't mean they pull price down. If coin is good and has big market then such selling is easily neutralized. Bounty Participants too want to earn good, why will they sell at lower prices. I personally never try to get rid of rewards, I always wait for right time.
So projects need to understand that Bounty Participants are worth respecting because they are true pillar for them and serve big part in success of ICOs.
It seems to me that you can't have it both ways. They are either irrelevant as you claim in the first part of your post, as in "bounty rewards are too low to affect market price at all", or they are more than relevant since "bounty participants are worth respecting because they are true pillar". If they are in fact a true pillar, then their impact on price can't possibly be neglected or discarded as inconsequential.
Apart from that, the total majority of coins offered in bounties are not very good, if not to say just bad. Therefore, in most cases the effect of bounty participants trying to sell the coins the very day they are awarded is devastating for the price of that coin.