That’s because Auba took a 50% pay cut to go to Barca - if we were trying to shift him on £160k/wk instead of £320k/wk then we might have been able to get a fee. (Barca have also massively lucked out with Chelsea’s batshit crazy nee owner!)
The problem we have is the only teams who can afford our players’ wages are other PL clubs, and none of them are interested - the only market there is for them is Europe and those clubs are all skint after the pandemic. Getting them off the wage bill might be the best we can do.
None of this is a problem with selling - it’s a problem with being bad at buying and utterly shit at contract negotiations.