When you want to enter the market and keep your e-money there are two completely different ways, one is your money investment, the other is the effort to promote the type of token you join. To receive a token reward.
So are you saying that we need to do both? Hmmm ... I somehow agree with you because doing bounty and buying token is also a good way to increase your total profit but itll also depend on the campaign or ico that you 've join . you know alot of ico's today are risky and wont end up verry well . so if you unluckily join them and buy their tokens but they didnt manage to become succesful , you also looose bigtime .