We weren't talking IP here.
When you're a HO spending $100 or sub $100 for a camera, the performance isn't going to be there....it can't be. When I'm spending 3X that amount for an analog camera at trade, one begs to ask what is the difference?
Optics, image chip, heaters/blowers, housing....lots of items. You can attempt to compare apples to apples and get the specs to match (LOR, lux rating, lens, etc.) and I can tell you it's not just a markup or marketing ploy for many of these units.
I've put in HO specified cheapies...you know what, when they die (often) usually it comes down to what is a direct replacement (usually nothing) and how long did they really last and what was the performance out of them. If the end user is OK with compromising performance for price and reliability isn't paramount, so be it. If they get luck with a unit, great, but generally there's a reason why the units are cheaper and it's not just because it's a generic or unknown manufacturer.