Okay, I'll bite; Why does the Square D QO cost about 50% more than other breakers?
Well, as far as I know, I've never lost a job to a big-box store. Plus, once I secure a job, who am I helping (or hurting) by buying each item for as little as I can?
I'd rather buy, say, a QO 200a main breaker in a 3R enclosure for $127 from a 'competitor' than the same two items seprately from a 'non-competitor' for %60 more.
Nobody says you have to buy everything for a job from one place. I've bought conduit from one place and wire from another because it cost less, even with shopping.
Besides, when I have to improvise or just make a complicated assembly, there's nothing better than looking, touching, and putting together stuff with my own hands.