I started to check some prices on Ebay a bit this morning and this is my conclusion:
The Football cards going for big dollar are the Autographed, Jersey, and Rookie cards (Graded at a 10).
Even super rare/limited print cards that used to be worth Hundreds of dollars in the 1990's are only being listed for like $10-$20 now.
If the card isn't authenticated at a grade of 10, the value becomes somewhat irrelevant.
So I looked into grading.... and it costs $20-$50 per card? I mean, I get it... but ouch.
I doubt mine would come back at a grade 10.
