Considering you would need an enquiry to unpick whether it was an ATC or an aircraft caused problem in each case it is never going to be worth the effort.
While the accountants may worry about the average one or two percent added to operating cost due to GAs of various causes, each individual case typically costs hundreds rather than thousands (aircraft dependent obviously) and around 10 minutes in time.
Is that worth a lawyer? Especially when you know your victim will make a point of coming after you when it's your turn to screw up. Everyone makes mistakes and sometimes it is better to just live with it.