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For me, it was never gambling rather, it was an opportunity to change our traditional financial system, where we always rely upon the banks to take care of our money instead of doing it alone.
Of course that is true, but only if you adopt bitcoin as a means of payment or currency.
As for investment opportunity, that's only up to us if we want to earn and double our money because it's not obliged for you to trade your bitcoins from time to time rather, just to hold it and buy as much as you want with the money you can afford to lose.
I guess without trading and use cases then bitcoin really has no value. If bitcoin weren't traded it would be hard to know how much bitcoin themselves are worth even that would only be back in the early days where bitcoin had no value. I also do not agree that trading and investing in bitcoin is considered gambling, but it is an activity that can give a trader or investor an advantage mainly because of his strategy, skill and use of his budget.