A lot of the terrifying aspects of slinging money around that people are talking about in this thread actually do become terrifying, once Bitcoin and friends are your platform. Fraud? Refunds? Someone hacked your server and stole your wallet? All that stuff is now 100% your problem, there is absolutely no way to “undo” of something wrong happens, and no infrastructure in place to handle any of it or any professionals with already a simple system in place for it.

I actually think 3% is roughly a fair fee for the processor to charge you, in exchange for agreeing to worry about all of that nonsense on your behalf so you can just collect the money. For in-person transactions, it’s mostly just a predatory rent payment, but for online transactions where the possibility for malfeasance is amplified, it makes sense to me.