Can you give any logical reasons why you would offer Paymate rather than Paypal?

I can offer several good arguments against using it:

It is more expensive

All payments are made using a card so all payments can be subject to a bank chargebacks.

No seller protection against genuine chargebacks even if you have incontrovertible proof of delivery.

Hardly any buyers will use it.

You cannot use it to pay for click & send  so have to wait for payments to reach your bank account.