It is correct what you write, but not everyone uses paypal, there are many especially German sellers who have taken the bad habit of using ebay and only accept bank transfers for payment ... I would never buy anything from them; so why should i buy items on Ukmart or usamart to pay exclusively by bank transfer?
I agree, i would not do that too if i don’t know a person. But at the same time i understand why people ask for IBAN transfer within EU for example, as far as i know IBAN transfer cost almost nothing for a buyer and no fee for a seller. Paypal charge 4-5% depends on the region, they are monopolists, the fee is too much, they are always capitalize on exchange rate etc. I would be happy to find an alternative to paypal that anyone can trust.
I’ll tell you more, i know a record sellers in UK who accept only cash even from an international buyers! They are selling very rare soul record and have been doing it for ages, cash only. I even send a cash (about 150 GBP) in a special envelope by post once to catch some very rare 45, but the reputation of the seller is second to none. My record has arrived, crazy story, i did it once in my life about 15 years ago. Some people just old school (and they don’t want to pay tax i believe). It’s convenient for them. I would prefer to get cash too instead of paying 5% to paypal and another 10% to ebay.