For most Venezuelans, getting access to cash is not a practical reality, even if it's a theoretical one. I went to Venezuela in 2011 and you couldn't even bring $1K USD worth of goods into the country without being taxed to death on it (or paying off some government official). How about cash? Also, I'd rather carry a USB stick with a private key on it than a wad of cash in one of the world's most violent countries (in the middle of an economic depression).