Signature campaign has always been the most rewarding way to earn a decent amount of Bitcoins. The only you would need to do is to invest your time to make quality posts and you'll be earning good profits. Trading is also a great way to earn Bitcoins, but you need to have experience in doing such task. 
Just keep in mind that you shouldn't think about earning with the signature campaign on. Instead, focus on your posts and contributing to the forum, and you will be rewarded with knowledge, experience, and happiness. Of course. I've learned a lot of things by browsing through the forums and making good quality posts. I don't do for the earnings, instead I do it to contribute to the forums and at the same time to have fun!
But hey, I guess that's that for our current generation here on bitcointalk
Yep, as I always say, our ATH in 2013 is what has (somewhat) killed cryptos. Before that happened, people around here were more than willing to help each other. People tipped each other for posts. Everything was about the community instead of "let me screw over everyone for my own benefit" like we see now. And I agree -- most people wouldn't be nearly as active without the campaigns. In my case, well over half my posts don't count regardless so I'll let that speak for itself, :p.