I think all of this can be profitable but having a difference from the highest level of risk is gambling because when you lose you will lose your assets, you better trade and become a campaign participant and if you can assemble and run mining tools.
Yes, most of the money we lose them in gambling only we don't know who is going to get benefits from it. So the best way to make money is through trading because we might analysis here to make a profit. Coming to bounty campaign it is a very good way to promote the ICO in order to make some profit after the crowdsale.
Anyone who is even using gambling as a footstool to make money is only living in a fools paradise as far as I am concerned. Gambling should never be among the list of anyone who wants to make money but should only be on the list of those who want to lose money.
There are so many productive ways to make money and part of it is trading even though it requires great deal of knowledge and experience to do well, same as mining. The only easy one which a lot of people have been doing for a while now is campaigns as you really do not have anything to learn or anything to lose in this case.