Emerald Coasting, judging by your screen name you and I work in the same area. I have plenty of experience with the company you mentioned. It is not a wise use of your client's money, as they could take the consultants salary and put it towards landscape improvements.
However, once this company is involved you have to accept it as part of doing business. This particular consultant will try to solve most site issues with extra fertilizer, aerification and buzz words like "water balance". The monthly inspections rarely reflect the true condition of the property and are often a reflection of the consultants mood.
The best advice I can give is don't ever argue with him and make sure that all items on the monthly inspection are completed by the next visit. Carry over items can kill your score. And if your score isnt high enough, you lose money from the client.