Novice Question

A question for the veterans of the board -- I have only made a couple of submissions to PSA, but from my limited observations, it seems to me that the PSA grading system is not very linear in nature. By that, I mean that the quality of a card that is graded a 4 seems quite inferior to that graded a 5. However, the difference between a 6 and a 7, a 7 and an 8, OR an 8 and a 9 seems miniscule. Is that a fair assessment or do I just have a terrible eye for judging a card's grade (and no, I admit that I have not invested in a loupe to inspect my cards)?
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Welcome to the boards!
Always looking for Topps Salesman Samples, pre '51 unopened packs, E90-2, E91a, N690 Kalamazoo Bats, and T204 Square Frame Ramly's
I have had some of the most gorgeous 5's around.
My Auctions
Collecting 1970s Topps baseball wax, rack and cello packs, as well as PCGS graded Half Cents, Large Cents, Two Cent pieces and Three Cent Silver pieces.