Firstly its unfair to blame Tiki he's just one member of a transfer committee; he's not the Chairman, CEO, CIO, COO, or CFO his role as Director of Football is to outline the footballing strategy and manage the squad he can only make recommendations I doubt very much he deals with the financial side of any transfer
The club has always had a strategy of valuing a player and his contract and not just paying what is necessary to get it over the line regardless of cost. They have a budget and stick to it, remember we are the most monitored club when it comes to FFP
This strategy has meant we have lost out on signings but so be it we are still the most successful English club
The rags would not allow Ronaldo to sign for City the negativity would have been nuclear, if the reports are true City weren't prepared to pay Juve a fee so clearly they weren't 100% committed the interest, if there was any, was generated from the player's side.
So, if the rags do sign him they are buying a player they sold for 84M making a 67M profit on, now 11 years later they are going to pay 30M plus agents and signing on fees with no sell-on value and this is for a player in a position they don't need to strengthen. They will increase their wage bill, take up a squad position and its a player who wanted to go to their neighbours