Look up gshocks around $300 on chrono24 etc. then go look up the new MSRP
There are collectible models that sell used higher than they were new, but for the most part they’re much cheaper
Then there are lines like MR-G. hand hammered metal cases made out of premium materials.
It's entirely possible that the more expensive "G-Shocks" were Mr G. I remember seeing wording about titanium cases, etc., but most of it was in Japanese, so the only thing that jumped out at me, were the price tags.