Question about buying graded unopened packs

I just bought a 1972 Topps football pack graded PSA 8, with a Staubach rookie showing on the back. I had no clue regarding a fair price, so I figured that paying somewhere in the VCP average range of what a PSA 8 Staubach rookie goes for would be a fairly conservative price. Does that sound like a good approach in valuating packs with stars showing, or should it be higher or lower? Curious to see what you guys have to say on the subject.
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I don't collect packs, but that is my opinion.
Dave
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.
Not very scientific, but used that as a rule of thumb and it worked well for me over the years