I believe his point was that once you buy them, they become used (by you). That there is no material difference between a well maintained used reg that you buy and service (or have serviced) and a reg that you buy new and has been through a service cycle (or more).I have NEVER used or bought used dive equipment in my life. I'd do it even less for my kids or wife or nephews or family.
I do sell my used, and serviced, equipment when I have newer or more up to date replacements. I am selling my slightly used SP A2 dive computer because I am getting the new SP dive computer to replace the A2.
Just my take, for what it's worth.
Respectfully,
James