short Botnet list and Cashing in on DoS

Speaking on Deep Background, the Press Secretary whispered:

Abuse using port 25 is a major issue today, why not solve it? If a user
wants it open, they could always ask for it or even pay more money.
Perhaps move to a static IP?

Greed. I'd cheerfully pay a REASONABLE amount for same. Say the
$5/month I did a few years ago.

But the beancounters say, oh no, that's COMMERCIAL service, for
.GT. 5x the price.