It depends how big or a little your profit it the end. If the bounty project become successful then you will be paid more than you expexted. But if the bounty project didnt reach your required cap then maybe you will be paid enough on what youve done.
In either case you are on good side. This is best thing about bitcoins that they will never give you any loss moment until you are not trying to get that personally. Bitcoins always broadcast opportunities and chances to everyone on this planet earth who is using internet and computer. So yes, one can earn best income through bounty campaigns and this is amazing.
In fact, the bounty campaign is basically using your signature to advertise their coins, applications or websites, which is a reward for the project.