It's easy to own commodities futures, but hard to use them to buy stuff directly. The closest you can get is having a brokerage account and using the debit card or checks to make purchases, liquidating investment portfolio as you go. But even there, you're using USD as the unit of account.
The point of most of these currencies (bitcoin, freicoin, et al) is to avoid the consequences of inflation. Yet because of the volatility inherent in the small monetary base they expose the holder to more inflationary risk. In laymans terms, the USD has never lost 90% of it's purchasing power in a month or two.
Commodities futures are far more liquid than bitcoin, freicoin, etc. USD has far less inflationary risk than bitcoin, etc.
Economies don't run on math, they run on confidence, there is little confidence in bitcoin/freicoin. That's the quintessential problem, like it or not, far more people have confidence in the $5 wrench (fiat) than computational complexity (cryptography).
