I think lots of people can't get past the name Seiko, and think of all of their products as moderately priced good watches. They don't think of them as a producer of luxury time pieces worthy of spending a significant amount on, and there are many other highly regarded brands in its price range. The GSs are really well made, but for me the designs are rather uninspiring.
I have to agree here. I really hate being a brand snob but not matter how many people fawn over GS, i doubt there are many that would take one over a rolex. This quote from another thread pretty much says it
Grand Seikos are watches internet nerds who never actually purchase them work themselves up into a frenzy over - such good value they coo, but somehow no one actually puts their money where their mouth is and buys one. I find them soulless with insipid designs, and the logo design alone is dreadful enough that I would avoid the whole marque because of it.
Last thing - and only because I keep hearing it - watch snobs are usually not thoroughly impressed by Grand Seikos. Dufours, yes. FP Journes or Pateks, yes. Grand Seikos, no. Grand Seikos impress Grand Seiko owners and the aforementioned nerds who always mention but never commit to actually purchasing one.