I think the amount that a club would pay to a single player can not be restricted to certain amounts as we all know that player’s importance to the club varies and this is part of what determines the amount to be paid to each player. The only rules that is ok to restrict clubs from over paying some players is the restriction on the total amount a club can spend over a cause period and it is already in effective. Barcelona had already made mistakes of giving some players way too much wage and need to either sale now or wait for the player’s departure.
There are players that earns substantial amount in a club based on their status in football. Let’s take in the scenario of Cristiano Ronaldo and Leo Messi, these players are from another planet when it comes to performance on the pitch and effectiveness contributions to their perspective clubs, they’ve been outstanding in all ramifications and consider the very best players in the history of football. No doubts, they deserved this huge salary because they worked extremely hard for it and their performance and stats portray it all.
A single player can be earning as huge as stipends compared to three players combined because he’s big name in the team, football have grown pass this level and it’s decided based on the structure of the clubs when it comes to wages equilibrium. You don’t expect Barcelona that’s experiencing finance crisis to be doubling twice the amount of player’s salaries, the team’s president,Joan Laporta tirelessly working for the improvement of the club. He doesn’t hold back because this is absolutely the right time to tackled down these standout problems that have facing the club.