I think that it is the only major leading source from where we can actually earn bitcoin
but i am not sure about trading
Let me put it this way:
- Campaign: Low risk, Low reward
- Trading: High risk, High reward
If you like big risk, then you also get big reward. If you are more conservative then go for campaigns.
You can make about 0.05
BTC with campaigns, with high rank. But markets can easily move 100% too, so one good trade with 0.05
BTC coudl also double that to earn that profit.
People need to find the best method that suits them, maybe it can be a combination of both, with diversified investments.