well, I hear you. the point you make about mining compared to coin exchange is valid. I just chose the mining way because I am not very good at the whole daytrading.
It is true I am invested in GH, but it is a very small amount, so I am not too biased in their favour by that factor (my amount of hashpower counted in S5s is less than a hand of fingers).
What does however make me biased towards GH is the fact that I have come to know and trust many of the operators, mods and hashpower holders in this enterprise. It is true we might not be making crazy ROI. But we are all, at least I guess so, taking a bet: that bitcoin and cryptocurrency as a whole concept will succeed one day. And that we will have contributed towards it.
While this is a very valiant target to pursue, do not forget the fact that profits are still possible! Just have a look at LTC charts at the moment. Do you feel joy? Or regret?
Profit belongs to the brave and the believers, to a certain extent. Oh, and that luck thing, which the abysmally stupid are so often graced with. Oh well.