I would guess that nearly every every agency has this model of instruction-- ...If you don't like the concept, attack the concept. There is no reason to pick out one of the many agencies that does the same thing.
John, I suspect that the agencies that include selling diving equipment into their instructor's programs as a mandatory requirement are in the minority. Neither CMAS, ACUC, NAUI, or IDEA have made "selling equipment" a necessary part of becoming a scuba instructor. In the past they have left salesmanship to the businesses that do this as a profit center.
I agree that you don't have to name the agencies that make selling a part of becoming an instructor, but I for one don't like the concept. I fail to see how this has a place in teaching someone how to dive safely. I can however understand why some agencies include it, as some make dive shop affiliation a requirement for instructor certification and if this is the agency approach, it makes complete sense.
Wayne