Yes, 3 points to send a null message, when you've trained your OS with thousands of points to set up your defaults for Subect: and To: That sounds correct. Not.

Also multiplying the claimed points by an estimate of the message volume, ignoring the optimization that would be done in the course of getting that volume out, or even subtracting the 3*nessage count points that you stipulate cannot be avoided: not the best math.

Perhaps a more scientific, and less juggled approach would be better.