Can I have a precise and constructive answer on whether trading is really worth spending time on? My brother wants to do this job for a living, and I'm just curious if it's a dignified, worth-spending occupation. I don't know where to ask, I don't understand technical analysis; when he explains it to me I feel it's some sort of gambling strategy.

I've used to read experts' discussions, papers, books and the like, but I find no such stuff on trading. It's a very vague term anyway. Are there really people who just "buy low and sell high", making a living by just doing that? I can't comprehend how can a person seriously make a living by something that looks complete gambling, instead of providing goods, services, work etc.

I heard that some bounties fail to pay participants at the end of work. Considering this senerio, how can one know which bounty is a good to participate in?

It would be better if you DCA rather than waiting for the bottom and buying at once.  Your idea sound great but the problem would be how to determine the bottom.  There is a possibility that you will miss it while waiting.  So I guess the best strategy is DCA, buy at every lower low, that way you won't miss buying the bottom.