Hey gentlemand,
I understand what you're saying and I respect your prospective. But you're kinda making it sound like trading has no risks involved or whatsoever which is not true. Either ways, trading or mining risks are always there.
I'm not talking about trading, that's far more suicidal and I really do not understand why so many people throw it around as a viable option when almost all of them will fail miserably. I'm talking buying and holding which could be regarded as a form of trading, but a much more long term one.
A GPU rig might cost $5000 for a few cards. That's 0.5 BTC. How long would it take to mine 0.5 BTC's worth of alts?
If it's for fun then go for it. If it's a financial decision then there are better ones to make.