Bounties are good but i think it gives us rewards after a long period on the other hand trading gives us instantly but i think do trading with enough knowledge about market.
So from that people prefer to do work in the bounty even for a long period of time. At least they are doing the best for now. I think trade is certainly profitable but basically the risks in trading are very high. So if people aren't ready to trade, of course they aren't recommended there.