I was able to join some signature campaigns that paid via BTC, however, at some point it is difficult to join due to limited spots, requirements, and the # of participants looking for bounties. Hope that this year there are still projects or more projects will have their campaign.
If you keep applying you will sooner or later find a spot.
Most smart managers look for quality posters. This means that the better you are at writing the higher are your chances of getting in. The truth is that most posters are very lazy and will either get discouraged by the requirements or that they were denied entry.
I've stopped wasting my time with bounties. Signatures are way better, but they still don't pay that much if you want to sell your coins immediately. Like right now i wouldn't sell because the conversion rate is so bad. Making money on the forum requires you to be smart and patient both in the way you earn coins and the way you convert them into fiat money.