if its a significant difference you could buy old certs, get them reholdered down the line into the freshest, crispiest new cert slab and then bank the difference?
If you’re buying as a collector the certificate number should never matter. You shouldn’t look at the grade alone, you should look at the card. PSA are completely swamped at the moment and it’s leading them to assign very questionable grades.
If you’re buying as an investor, unless you’re buying to immediately flip this logic is flawed. Let’s say you pick up a card today for $1,000; some fresh grade PSA 10 with a brand new cert. Now let’s say you hold on to the card for a year or two. Uh oh, your brand new cert is now no longer a new one any more - is it now worth less?
Finally, PSA assign certificate numbers when cards are registered in their system - not when they’re graded. Right now there are low-5xx cert cards being graded which were submitted early last year, meanwhile a super express submission from the end of 2020 will have had a 6xx cert. Are these 5xx cert cards less desirable despite being graded more recently?
These are rhetorical questions and not questions I’m expecting you to answer - I completely get your argument that people pay more for newer certificate numbers and sadly it’s true for the generic set cards like the ones you’re after, however the reasoning behind paying more is completely misplaced and you shouldn’t necessarily join that crowd if you know better.