[GordonS]

> Because they give more benefits (insurance, lounge access, cashback etc...) and someone has to pay for this

The company (or cardholder) pays for this - corporate cards and the like aren't free, they come with an annual fee. So it's not all on the merchant.

[thiscatis]

These fees are usually waived based on spend and often just require a simple call to the issuing bank. Even 400 usd won’t cover hundreds of thousands of airmiles gained by spend.