In the old fashioned way, if a wife suspects her husband of treason, it is easier for her to ask the granny at the entrance if the missus will bring another woman (man?: D) home in her absence, and not run to the nearest BH.
In addition to marketing, there is also a lack of general awareness among citizen clients and culture as such. And the money for the services of a detective is not enough.
Perhaps those forum users from Western Europe, America can say how things are going with them? At least they would share the theory, if any, not to mention practical mechanisms.
In general terms, of course, the owner / manager of YES should familiarize himself with and / or study the marketing course (and management, too, if he ran past the university
), and already know
specifics directly
private detective work - this must rely on
amateur performance, personal imagination and own mistakes in decision-making, on which to learn
.