I do not own one, but believe you are correct on the parts difference including shell plate, and yes 1,850 is a lot. They are however rare, and few and far between. The value is set by the seller in hopes of a buyer. Interesting to see what/if it really sells and for what.
Makes we wonder what my wife/children will be able to sell my Star's for in the distant future. With the improvement of progressive reloading (Dillon 750 for example) who will want to buy a Star that has not been produced in what is approaching 30 years.
Bruce Williams might jump in here, but I would suspect no one is making clones or copies as it is to a very small and costly market. Much the same reason no one is making a current Star reloader. With such a small market, one has to wonder how many they would need to sell to cover development and production costs as well as realize a profit. The market is much smaller than just all Star owners. I would suspect that many Star owners reload many rifle calibers beyond .223 that these cannot be done on the Star.
I for one load .223, as well as 30-06 and 308. all on a Dillon. While I would certainly like to reload .223 on my Star, I would still need another option. And at 1,850, I could buy a lot of components. (If you could fine them these days in any quantity).
My 2 cents
Regards
Kenn