He proved that he wasn't a one season wonder.
There's a big difference between Cruz and most of the WRs listed. The (most) ones listed are big, strong, physical WRs that can make the tough catch in traffic. They are far less reliant on "getting separation" than Cruz is. Honestly, I don't think Cruz is that kind of WR that warrants top dollar. His skillset is more easily replaced than most of the WRs listed.
Don't get me wrong. I love him to death. But for top dollar (assuming he asks that much), I'd take many other WRs in the league over him. Numbers don't lie. He definitely no one year wonder. But he lacks the physicality that warrants the big contract.
Can he catch the ball? Can he run? Can he catch and run? Can he score? Is he a reliable target? These are aspects that matter, and Cruz conforms to them in a big way.
For example, I'm not saying he's yet at the level of Roddy White--although Cruz's 2 year numbers are actually a little better than White's, the past 2 years--but Cruz is the same size as White. Is White not worth "the big contract"?
He was on ir his first year. He Was older, and thus closer to his prime than virtually all of those guys during the two years
I don't think Cruz's stats first two years are anything to scoff at. What probably helped him out the most was he was unheralded coming out of college and I'm sure teams didn't forge a strong game plan based on his skills.