I haven't made anything from bounty campaign the only reason being that I haven't participated in any of them. I think it's better to be part of a signature campaign (even if it pays you in altcoins) than to part of Twitter or other social media campaign at least the signature pays you better than social media campaign.
Although I have made a couple of dollars from airdrop back then I was really active in airdrops and the highest I've made from a single airdrop was $200. But right now I rarely participate in it because they give you tokens that will never get listed.