Therapists who are licensed are overseen to a certain extent in that they have to continue their professional education. To be a reunification therapist means nothing in particular. Now, you can have a person who is, in the United States and, I think, in Canada too, a board certified specialist in a particular kind of psychological work. For example, you could have a board certified forensic psychologist.
There is no such thing as board certification in reunification therapy. The people who are doing reunification therapy on the whole are people who, as you say, will receive a good deal of money for their work. If we keep in mind that when we're looking at the intensive treatments, the so-called camps, we may be looking at $20,000 or more for a four-day session...so you're right: Follow the money.