If you are offering 550k pw then you aren’t signing mid table players and there is literally only RM and City for them to choose over you. They can’t sign every single elite level player so you will end up signing some
Your mindset implies there's not a finite supply of such players.
Unless you're seen as a viable big trophy route; elite players (with elite mentalities) won't come... Not for the sake of an extra 10-20kpw.
As per the 'highest paid' list you posted.... Most of those aren't elite.