Can you point me out the ones that do? The popular exchanges of that list I know don't, except Bisq.
In addition to the ones o_e_l_e_o mentioned
I know a few people who have used: peachbitdoin
https://kycnot.me/exchange/peachbitcoin /
https://peachbitcoin.com/PERSONALLY, since it's mobile based although it does avoid KYC it is not really anonymous unless you are using a disposable smartphone.
Not a lot of offers but it is yet another option.
They have to pay for the back end upkeep
The back end only costs a small fraction of what they charge. Most of this must come from the space they rent. And judging by the rentals nowadays, it's understandably expensive. Customer support is also an expense to consider, right.
Those are all fixed, if they have 0 customers for a couple of days, the people still want to get paid, the stores still collect rent and so on. The KYC is independent of all of that.
It's independent, but it was their only weapon to compete CEX, until recently. They don't have future now more. As I said, you can get the exact same service from a centralized exchange, and much cheaper. And I don't blame them. Regulators must be pushing them.
Part of the % is also convenience. No looking for people to trade with, no waiting for someone, no worrying if you are going to somehow get scammed. And so on, you put in cash and get
BTC or you put in
BTC and cash pops out of the machine. There is a cost for convenience.
Humor, and unrelated but it makes the point. Back in the early 1990s there was an earthquake in southern CA, there were people complaining that some of the local convenience stores were price gouging / profiteering on the fact that they had things that people needed and were marking it up because of the earthquake. They actually were not, they were just that overpriced since they are convenience stores. Get in get what you want and get out....
-Dave