the rewards for working on a bounty depends on your forum ranks and on the social media accounts that you own .
Mate, it's not just botcointalk that only holds bounties, there several forums out there that offers the same, and also bounties are not just based on forum ranks, we have so many bounty campaigns, what you're saying is just for a signature campaign.
the profit that you get on trading are also market dependent and trading is not free . if you dont have a capital , youd better do bounty .
I started trading on early 2018 with only 0.001 BTCs, I started only with shitcoins that has a below $1 value, it's also a matter of strategy on how you'll get your profits, I was able to make a Ten Times profit after a couple of weeks and make a withdrawal request on binance. After the fall of the altcoins I'd try to leave it and wait for a high possibility of earnings, until now.
It's not always on the money that you've invested. We have brains to use and not just waste it for anything else.