One thing that realtors, clients and a lot of electricians tend to forget is that 'problems sometimes only show up during a ground fault, surge or other overcurrent situation". Sure, the panel looks fine, the poor connections on those equipment grounds look fine, the FP panel looks OK, etc. That's because 'there hasn't been an accident... YET" I use the air-bag analogy with electrical issues. "The air bags are here, but they are known to sometimes fail in an accident" (FPE). "You have the airbags, but they are not connected properly according to the manufacturer's specs" (Poor equipment ground connections). "You have a Toyota airbag in this Ford panel" (wrong-brand breakers in panels that don't accommodate them...the extreme cases..). Use the airbag and they get it. Go on and on into the world of invisible electricity, they glaze-over and defer to the 'master electrician' locally or the local AHJ inspector. I also tell them that the panel manufacturers and equipment manufacturers employ electrical engineers... Electricians are the 'plumbers' of the electrical distribution world.. Not to beat them up, but that is the way it goes. IMO, this country carps about the lack of white-collar education out there.. Forget that... Let's get the blue-collar trades people up a notch. Junky work is going in all the time now..