I agree with part of what you are saying, but if you look back to the past five years they have changed their housing just about every year. So if you have a two year or three year old housing you cant get it repaired? Do you think that is true with all housings? These are the things I"m looking at as I shop for a new housing.
well they are forced to change their housing by the market and technology.
If you'll notice that the "shelf life" of a digital camera at any electronics store is only a couple years at most... I'd say most are less than 2 years.
cameras are replaced every year by new ones that are higher tech, higher megapixel, have more features, better menus, better battery systems and are more compact. People want smaller (thinner, lighter) but want a big LCD. So they have to re-design the entire camera.
The SeaLife cameras are not newly designed cameras only made from scratch for diving. They are existing designs that they modify slightly to use in a housing and them have to make a housing that will fit existing buttons on that type of camera. So they are forced to change just because technology changes.
For example the Sealife Reefmaster DC310 is a Fuji made camera. I can't remember the exact model, but it's basically one they bought, re-branded, and upgraded the firmware to work better in low-light underwater conditions. To shoot underwater you change the mode in the menus (via firmware).
Ikelite has the same problem. Every year new digital cameras come out. They have to decide which ones to make housings for based on which ones divers will want.
so yes I think it is likely true with all housings.
Just to show how technology changes, to buy an old Olympus D360 (I think that was the model) 1.3 megapixel new was $300 bucks. Now most cell phones have at least a 1.2 or 1.3mp camera. the D360 was bulky, heavy for a point and shoot and used 4 AA batteries. Now days it's not worth anything as better, lighter, faster cameras are out there with better features. Because of that, the housing market for the D360 when from high price, to "clearance sale", to now no one wants them anymore.
It's not the dive consumer market that pushes these chagnes on cameras. It's the entire camera market. The dive industry camera sales I would guess is less than 1% of all camera sales. It is a slave to the bigger market.
If Sealife/Reefmaster, or any other camera company, doesn't change or come out with new products in a timely fashion, they'll get left behind.
If you want a perfect example of this, go see how much 35mm Reefmasters with housing go for on Ebay. Most won't get more than $15 to $25 bucks. Technology has just left them behind....