I think Pryor was a product of being the only viable threat on a team lacking any true impact players. We saw the same thing with Kamar Aiken. Aiken had a very good season when he essentially was the only healthy body on the field. Would you pay him $8 million a season based on that performance? Pause for a moment and let that sink in and before you say, "Kamar Aiken ain't no Terelle Pryor," allow me to post their stats and you will see just how similar they are.
Pryor:
140 Targets 77 Receptions, 1,007 yards, 4TDS, 13.1YPC, LONG: 54 Yards
Aiken:
127 Targets: 75 Receptions, 944 Yards, 5TDS, 12.6 YPC, LONG: 48 Yards
Keep in mind that Aiken also had Matt Schaub, Jimmy Clausen, and Ryan Mallett throwing him the ball for a majority of his games.
Arguably they are pretty much the same player and they are the same age.