I see cryptocurrency ATMs in various random places around town, they're evidently not too complex for common usage. I think this is a bit of a chicken and egg thing, people would figure them out if sites like Gumroad actually used them. Porn is a powerful motivator for human ingenuity.

And yeah, Bitcoin's fees are silly and I wouldn't recommend it for anyone wanting to use it as a currency. The Bitcoin community long ago decided they wanted to be "digital gold" and are firmly dedicated to making the token unusable for anything other than that. For general currency usage I'd recommend looking into stabletokens like USDC or DAI, they run on the Ethereum blockchain instead.