I wrote this payment service company early Jan and proposed to charge a large quarterly payment if they would reduce to sub-2% range...they declined outright.
At 2%, this is break-even in the sense that a charger should never be willing to pay over 2% surcharge to get miles that are valued only a 2% (2c/dollar).
They didn't disagree, but mentioned issues of fixed costs, etc.
FWIW.