We can challenge FFP/PSR, but we've chosen not to be the ones to bring it all crashing down.
Just because I agreed to join Need For Speed road racing club, doesn't mean the 70mph national speed limit doesn't apply in Law.
You can't exceed 70mph regardless of club rules, likewise we can't legally be stopped from investing what we like in our squad because of FFP/PSR.
The fact we've agreed to FFP/PSR means little in the big scheme of things in UK Law, otherwise the old bill would've long since felt Khaldoon's collar for allegedly spending too much on his employer's business.