While I hear your point, I don’t see how crazy wages or agent fees cause issue? Just don’t pay them! City have walked from many a deal for that exact reason, other clubs can do the same. Maybe if they did prices would come down? So it’s only unsustainable if a club spends beyond its means to acquire said players and in that instance it’s their fault not the system.
Spurs cannot moan about wages or fees when they claim Kane is worth £200m, they can’t have it both ways lol. Once teams do spend what they can’t afford and buy these players they then fail to make them fit and you double down on the issues. Nobody is forcing anybody to pay high fees or kickbacks, clubs bring it upon themselves unfortunately.
Just my tuppence