I want to ask how does the people that do bounty make money.I mean they are giving away money for free.How is it profitable for ICO teams?
Because very less amount of people invest in their ICO through bounty.

If the bounty is paying with their own tokens then of course it is profitable, it didn't cost the developers any money to create those tokens since those tokens do not have value yet, the ones working for those tokens are the ones taking on the risk because if the project is not successful then all their work will be for nothing.
Clear explanation.