but I somehow see that it is a risk where you do the work and wish success for the project, in order to get a good return.
The problem with altcoin bounties indeed. You need to hope for that project to succeed to maximize the bounty rewards. Its still a gamble actually and that is a choice of hunters. Unlike to regular btc paid campaign which is fixed. Altcoins can sometime have overwhelming rewards, and honestly its luck if you did choose a good campaign or project.