[dougk16]

Is "purchase" some technical definition you're using? I've purchased many goods and services with cryptocurrency these past few years. Used physical silver a lot as well. Even paid rent. Also partially paid a contracting bill with one ounce of gold. It takes a bit more legwork and explanation but monetary systems don't change by magic. It takes an impassioned minority individually putting the work in.

[wmf]

You can do it but it's not a good idea. Transactions are slow, they're public on the blockchain forever, fees are variable, there's no way to correct erroneous transactions or dispute fraud, and of course you're missing out on future appreciation.

It's worth going through eary adopter hassles if the eventual result is better, but crypto won't ever be better.

[dougk16]

I generally only use private cryptocurrencies with low fees and fast transaction times, like Monero and PirateChain. If I have to use Bitcoin or any other surveillance coin, I am well-versed in "cleaning" my coins, but that's not desirable for a number of reasons. Perhaps you're focusing on co-opted surveillance coins, but privacy coins are amazing.