I'll concede on semantics. It's smarter to
speculate on the currency itself than invest in mining hardware. To be fair, there's disagreement over the difference between investment and speculation:
http://en.wikipedia.org/wiki/SpeculationI disagree that Bitcoin's value is nebulous, or beanie-baby-esque. I believe Bitcoin can become valuable in 3 distinct ways:
1. Store of value
A universal store of value not controlled by governments. This isn't merely a hedge against USD inflation—it's a global means of protection against currency devaluation. Bitcoin is attractive to anyone living in a country with an unsound monetary base. This is already happening.
2. International money remittance
Existing players in international money remittance charge exploitive fees. Western Union often charges more than 10%. Bitcoin offers a viable low-fee alternative. Bitcoin remittance services like http://buttercoin.com are now starting to come online.
3. Programmable money
The true value of money as a protocol is difficult to predict today. I believe this could be absolutely massive. At minimum, this means native cash for the Web. Merchants have an incentive to adopt it — they bypass Visa/MC/Amex's 3%+ transaction fees. But the ease-of-use isn't there yet. The margin on many consumer goods is very slim — an additional 3% profit could be huge for many online retailers.
At Bitcoin's extreme, we could see self-sustaining profit-seeking algorithms. Corporations that don't employ people — algorithms providing services and collecting profits. We've never been able to wire up software so directly with the flow of money. I think that could lead to exciting things.
Dismiss Bitcoin as get-rich-quick speculation if you want. But I think you'll find most Bitcoin fans aren't just in it for the money. They realize Bitcoin can be massively disruptive to the financial industry — an industry begging for disruption. I think that's worth investing in.