I am only speculating, but looking at it from the logistical position of the manufacturer, I believe that they plan ahead to release a fixed, limited number to ensure they will sell all of them, rather than to make a small group of collectors happy, or to give the watch status as a rarity. Given the various suppliers and in-house studios where the watches are made, it's a giant logistics puzzle to have enough of the right cases, dials, hands, movements, straps, packaging, marketing, etc.
If they are lucky enough to move them all and there is still demand a year or two later, they do another batch.
This may NOT be the case with big names, let's take Panerai, or maybe Hublot, who constantly release new varieties. But having watched the GS world for about 15 years, I don't really think they operate the way Swiss companies do. I could be wrong but I just don't see that in the past GS or Seiko either knew or cared very much about what collectors think about their watches. Perhaps that is changing as GS gets their own management and marketing teams going around the world.
Mike
When I went to Japan 5-6 years ago and did tours with Seiko as my host, they were quite surprised at the number of Seikos and Grand Seikos I have, and I'm not a BIG collector by any measure.