But I bet it's higher than ~3.5, which means this is a niche solution even if they're the only people in the world using Bitcoin. It's also stupid, but hey, a lot of things that people use to make a living are stupid.
And no matter what the ledger says, the person in physical possession of the trading card is the one who owns it, because the government isn't going to recognize Bitcoin as proof of ownership.
So really, we're talking about a barter economy because the Venezuelan bolÃvar is in the shitter, and a portion of people using a particular item as a substitute for currency tracking it (though it's not really currency since it IS the value, not a promissory note) with a blockchain.
Err... OK. Personally, I'd just keep the damn cards somewhere safe. Or, given that you're already hiding economic activity from the government by using something other than the official currency, I'd just use the USD everyone would ultimately exchange the cards for anyway. More reliable value, easier to subdivide, easier to spend if you get out of the country.