I think of it like this, injection molded plastic which can be produced at a pretty fast pace vs machining blocks of aluminum or cast aluminum which sounds more labor and time consuming. Gmk isn't even that good compared to some of the clones out there, for example the gmk mecha-01 vs a clone the clone has a more accurate color in terms of the darker purple and a more neon looking green. Ppl always say support the artist but the artist didn't do anything literally pick 3 colors with a theme usually inspired by some form of media and make novelties by simplifying a already known symbol/emblem by all means not every set is a copy of something there are original ideas.