if I see it like that happening now, many newcomers who want to join bounty campaign. I'm sure most are looking for money and only a small part of the fun . If you have a problem with income, you should look for a larger campaign that has a limit of participants I'm sure this will pay you more leverage.
There are plenty large campaigns with no limit of participants, if you pick them your rewards will get divided by many and you might only end up with pennies, keep that in mind too. Besides, why would a bounty manager limit participants, it does not cost them any more but the get additional buzz