I completely agree. Some of the designs are poor, but that's true of every brand. Finishing is always best in class though. The Snowflake is iconic though <3 https://www.watchfinder.co.uk/articles/review-grand-seiko-snowflake-sbga21
For every pretty GS there also a horror show. Casio Edifce for nearly 9K anyone? 2019 piece that's lost 35% of it's RRP.
iguanasell looks like a knock-off website, they are not featured on the official authorisors list
Shhh.... keep it quiet. You don't want everyone to know about GS ;) (I have a Snowflake btw, and it's just awesome)
Yes agreed about depreciation, but there are many more that don't fall off a cliff like a Tag does. Nomos comes to mind, and I'm sure there are lots more.