/sarcasm
Well, the main idea behind these campaigns is to pay people for doing something they like, and would otherwise be doing for free - it's not supposed to be a job replacement.
But I guess all that kind of depends on where you live, and what type of campaign you join. So, for example, LuckyBit pays about 0.002 btc per post (for a maximum of 50 posts; for Senior and Hero Members), which at current prices comes to about $0.70 per post - that's a considerable amount in some countries (though not where I live, unfortunately ).
Once you become aware about different ways of earning it, you need to choose the best way which can give you good earning in short time, but make sure that you don't choose gambling to earn it.