The best way to earn bitcoins and hence money with it is just to buy bitcoins and hold them for long time.But this would only be investement and not full time work.I wont consider leaving job for it now.But if you earn huge from it at some time then you can sure leave it and take rest 
Doing campaigns and holding bitcoin may not really lead into a income its merely a saving and assurance for future , though joining consistent campaign and doing at works at marketplace can lead to a earning still.