Maximum Motorsports, and Griggs, and even Steeda...R&D and test their parts on RACE cars... That is where the cost comes from. For every 100 design permutations a company comes up with, maybe one or two have elements that make it to the final product. Designing something on a computer is cheap, fabricating the initial product, testing, and then revision followed by jig and template creation is where the money goes. The reason for the higher price on MM/Griggs parts is not just R&D costs, it's quality, performance, and yeah, a little bit name brand price jack (minimal at best). And hey...How can you tell the designs are exactly the same by looking at pictures on the internet? Did you measure the distances between pivot points and fixtures with your psychic powers or something?
Oh and here, I'll take your challenge - a picture of my MM K-member and A-arms. Lets see your "quality" GMS/Ching-Chong-China-Made peices!