Thoughts on a card collection

[EYECOLLECTVINTAGE]

Hey everyone,

So over the past few weeks I got in a few nice collections on consignment. I am familiar with cards, the one aspect that continues to elude me is the grading.

Let me give a quick example.

I just got in a box of over 500 1975 Topps minis. These cards look pack fresh and smell brand new. Sharp corners, gloss etc. I was thinking of bulk submitting some non stars, however these things bring back less than the submission fee if they are graded 7-8. How can you even tell the difference between a 8 and 9? I know they have the PSA grading standards, but I'm worried we send in 100 of these things and they all come back 7's.

I also got in about 500 1969 topps cards that all look pristine, but I worry about the same thing.

There really is no way to know if something will get a 10 I am assuming correct?

Am I better off selling as a raw lot of NM+ cards?

Thoughts would be appreciated.