I don't think that is always the case, although it may be true most of the time. There are a lot of variables to throw in there. I mean that if somebody buys into the "most profitable" routine, then they have to buy into it fully and completely or else it won't be most profitable. Obviously six ops isn't the key to success alone, but in conjunction with a certain number of hygienists, assistants, good front office staff, certain equipment, patient flow/average time per visit, etc.
And in fact, unless those things are completely aligned the doctor is going to lose money. It does me no good to have six ops if I have one hygienist and I myself am slow as dirt doing procedures.
I am curious as to how big ops usually are.