I guess I've only been exposed to the independent scene (which I would assert accounts probably for the majority of releases, if not the sales volume)

That you're using a handrolled engine is fine, I'm sure your company knows what they're doing. But in the context of this post, and for people who'd like to start game development/design, saying that most devs write their own engine is in my opinion damaging, as I really don't think that most smaller studios do. It increases the barrier to entry, and perpetuates a certain amount of elitism, which really considering the make up of the industry is no help at all.