The PSA/SGC/BVG/BGS debate has happened over and over again, but the gist of the reason that BGS/BVG sells for less is:
1) People aren't competing their registry sets there. (SGC gets bit here as well.)
2) People don't trust BVG to detect trimming, since they will grade sheet-cut cards (like O-Pee-Chees Gretzy rookies with all straight cuts) and cards shorter than spec (1993 SP Jeter).
3) First mover advantage by PSA.
4) PSA's bulk submission pricing.
5) Higher PSA realized pricing begets more submissions to PSA.
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PWCC: The Fish Stinks From the Head
PSA: Regularly Get Cheated
BGS: Can't detect trimming on modern
SGC: Closed auto authentication business
JSA: Approved same T206 Autos before SGC
Oh, what a difference a year makes.
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