From what I’ve seen in actual sales and auctions, along with read and heard from others, PSA 9 and Raw will be roughly the same value for a lot of modern era cards.
PSA 10 can be anywhere from 1.5x - 3x the cost of a PSA 9.
It really depends on print run and era of cards. Older cards or cards that are hard to gem, you’ll see a higher multiplier on the 10.
I know it would just be your opinion, but do you think $300-400 on those playoff ticket on card autos for Cam would be a good price to buy at for PSA 8-9? I want to pull the trigger on the PSA 10 one, but I don't know if I'm getting ripped off for $1,500.
Edit: And, do you think it makes sense to just stick to PSA graded cards for NFL instead of Beckett?