But seriously. . . .

[swarmee]

Originally Posted by JollyElm

1. Does the "weight" of particular cards get updated/changed from time to time?

2. Say there's a card with a very low total pop (in other words, virtually impossible to ever find), but you're lucky to have one in mid grade, is it 'worth' having it in your registry (the alternative being waiting until you can possibly find a higher grade one at some point)?

3. Is their some sort of bonus for having a set 100% complete that would make Question #2 basically moot?

1) It can. Normally doesn't until someone working on the registry makes the suggestion; you can recommend a new points scheme, and if it's a popular registry, they'll put it to vote.
2) It's better to have any spot filled rather than empty for the overall Set Rating, which is how they rank order the sets.
3) You can earn up to 3 free grades a year for completing 90% of cards in a registry set.
https://www.psacard.com/psasetregistry/benefits
And if your set is top ranked at the end of May each year, you get an icon that your set was the best that year.