1973 - 1st player to ever rush for more than 2000 yards.
Also had multiple commercials for Hertz and other products continually airing on TV.
Seemed like a charismatic guy.
All this combines with the increasing popularity of football back then pushed his rokie card higher and higher.
_________________________
"The government’s view of the economy could be summed up.....If it moves, TAX it. If it keeps moving, REGULATE it. And if it stops moving, SUBSIDIZE it.”.....President Reagan, 1986