Part of the problem is also that these "home inspectors" are rarely qualified to determine if residential electrical installations are safe or not. The turnover of the house from owner who did the hack wiring job to potential new owners is the best time to identify wiring faults. A prudent buyer should at least get a licensed electrical contractor to inspect the electrical. The home inspectors will often just tell the owner they need a GFCI receptacle to give the impression they performed their due diligence.