A house brand is a brand that is badged, and sold to a single retailer. The actual product being sold may be manufactured and sold under other brands. Rosewill does not meet this definition as they are sold
by other retailers. However, this is mainly pedantry, if you were to say "a Newegg bargain brand" then yay.
The poster child for house brand around here would be ServeRAID, IBM's line of rebadged mostly-LSI products.
There are numerous retail brands like this: Rosewill, Syba, Startech, C2G, SIIG, etc., all of whose business models and product lines appear to be something in on the spectrum between design-it-have-Asia-make-it-container-ship-it-to-US to just-look-around-a-Shenzhen-back-alley-to-see-what's-being-sold-today. If you are looking for unusual minor bits and bobs, it often turns out that only one or two places in China actually makes what you're looking for, and everyone has the same product under a different label.
Now as I've said before, the problem in the PC market is that it is very competitive on price, and basically this results in a race to the bottom for the cheapest possible $#!+ that can still be claimed to work. If you build something that's quality and good, you're not going to be able to charge much more for it, so to a large extent, no one tries for consumer-grade gear. This is fine for Windows PC's where blue screens happen and bits go missing now and then. For those of us working with FreeBSD who have reasons to want our stuff to work, it results in a Hobson's choice scenario: you get one cheap POS SATA controller or another cheap POS SATA controller, both bad choices. So my solution to this is to move on to server-grade components, where a different set of market forces compels better hardware design. Unfortunately it is also exceedingly limiting in what your options end up being, but on the positive side, it tends to lead to good design decisions and reliability.