Just like in any other professions, there are also qualified and unqualified professionals in the home inspection business. It could be very difficult identifying a good home inspector from a bad one. There are just several states in the US that are imposing regulations and licensing requirements to home inspectors.
In areas where regulations are not stringent about home inspections, anyone could easily pose as a home inspector. You surely would not want to pay fees to home inspectors that are actually just mere con artists. Worse, if you are selling your house, you might actually jeopardize your transaction just because the home inspector screwed up.
Home inspections are tedious tasks to do. It is not like somebody would just enter into the house and run an ocular checking. If that is the case, you could do the task yourself. But that is not it. There are many factors and aspects that need further and more detailed attention. This is the reason why professional and well qualified inspectors are needed.
There are several usual scenarios that demonstrate why there is a need for actual and professional home inspectors. First, suppose you are about to sell a house. If you have hired an unqualified inspector, he might just walk in and see if there are visible and obvious cracks and damages. In an instant, that inspector may give you a report certifying how well your house is for selling. If the prospective buyer walks in and brings his/her own home inspector, you are in trouble. You might even be accused of trying to tamper inspection results, which in some states could lead to legal battles.