Current bounty payments are very cheap, you can calculate the $100k bounty and the number of participants is 2000 so that participants only get an average of $ 5 and it takes up to 4 months, of course this is not suitable, but for those who have a lot of time it is certainly not a problem
its be bounty manager and developer team deal. they want as much as participant in order to make them more popular into cryptocurrency community and attract them to be investors. And dont forget we never what will happen to market , sometime although we receive very few token but in markt it could be very worth . Look at DIA as example , first bounty hunter complaining reward to small , but when it finished and enter market suddenly they smiling.