I don't get why people are saying RBs don't deserve big money. Running Backs are the most cheated NFL players in the league. The average career of a RB is 3 years and done. Why? Because they are often the smallest guy and get pounded 20+ times a game it's brutal to their body. So often times whatever they signed for in their rookie contract is going to utilize their best years in the NFL.
While it might be strategic approach to underpay a RB it still cheats them more than any other position that's all I'm saying. They have short careers because the position they play is the most brutal one.