Seems as though you have no comprehension of how astronomical a wage it is to be paid despite me pointing out it's what the majority of premier forwards in the league are being paid.
Calibre didn't save Rooney from an unceremonious end, despite him fitting the criteria you've put forth. Cavani was essentially tarted around Europe with absolutely no takers with less than 72hrs of the transfer window left, does this strike you as odd?
I am certain his wage will be commensurate with what he expects he's worth - ergo, not cheap in the slightest. If I'm wrong, and he's being paid in line with what a soon to be 34, ailing forward should be on, I'll gladly come back and hold my hands up. It's not even his age that is the issue here: it's the clear decline he has shown from the forward he was (the one you're talking about), to the player clubs have had no interest in.