Original membership fee for football clubs wishing to join the NFL in its first season, 1920: $100
Number of NFL's original teams that could actually afford to pay it: zero

Average value of an NFL franchise today: $2.4 billion

Most Super Bowls ever won by one franchise: 6
Number of teams that have won 6 Super Bowls: 1 (Pittsburgh)
Number of teams that have never appeared in a single Super Bowl: 5

Annual value of the NFL's first league-wide television contract, negotiated in 1961: $4.65 million
Annual value of the NFL's league-wide television contracts today, through 2022: $39.6 billion

Of the top 20 highest rated television broadcasts in American history, number that are Super Bowls: 10
Of the top 9 highest rated television broadcasts since 2000, number that are Super Bowls: 9

Number of African Americans who played in the NFL between 1920 and 1932: at least 13
Number of African Americans who played in the NFL between 1933 and 1945: zero
Percentage of today's NFL players who are African-American: approximately 70%

Face value of tickets to Super Bowl I in 1967: $8, $10, and $12
Face value of tickets to Super Bowl today: around $1,000

Price of a 30-second ad broadcast during Super Bowl I, in 1967: $42,500
Price of a 30-second ad broadcast today: $5 million