The fact that SGC didn't generate long grading lines (or any lines at all for that matter) while their competition had lines wrapping around the building tells you everything you need to know about about why they've chosen to not grade cards at the National. Especially nowadays where the shows are perpetually patrolled by an army of social media "influencers" who can't wait to post videos comparing them against PSA and trashing them for not having a line.
Add in the fact that it doesn't make economic sense for them to send a grading team, and it's really a no-brainer decision.
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