We strongly discourage explicit surcharging of members for any of our payment processing services, and will not support it in custom fee calculators that we build for the club.
We do acknowledge that our payment processing charge of 2.9% is a cost to the club that can add up to a sizeable amount over the course of a year if they are used heavily by members, but there's also substantial cost to us to operate these services on your behalf too.
It comes back to what matters more to the club - cutting costs vs. risk and volunteer effort. All of our payment processing services are optional, so if you'd prefer to save the club some money and handle money directly, manually receipt payments, and make chasing debt a bit more difficult and long-winded, then that's entirely your decision. We're not going to get upset about it either. It's always going to be a question of whether the value is being received for that cost in the form of the system doing the bulk of the work to reduce the load on your current and future committee members. Our payment processing services do collect money quicker and more efficiently than 'traditional' methods - the anecdotal feedback we've had from our clubs to support this is now incontrovertible.
By attempting to transform our payment processing charge into a surcharge for members wanting to exercise that payment method makes no sense to us. It's such an extreme disincentive for them to settle their debt straight away, and our advice is to just turn off all of our payment processing options altogether. They won't benefit you the way they should.