They may have spent big on him, but he didn't help the cause and wasn't even on the team the last half of the season. Even more justification to not pay big money to a WR. They did. They lost him. They were runner ups in the Super Bowl.
It doesn't matter if he didn't help
They spent the money, and if he weren't a turd they certainly wouldn't have been any worse off.
The coincidental outcome of 4 teams without a top paid WR on their roster says nothing, just as the fact that only 1 top paid QB was in the final 4, and that guy didn't make it to the Super Bowl.
In fact, 3 of the QBs in the final 4 are in the bottom half of average pay for starting QBs.
I guess that means successful teams don't spend on QBs either.