Need some YM 40 Dark Rhodium Info

[Socalwatch]

I had the pleasure of trying this beauty on this weekend and it is a stunner! I'm searching for my first Rolex and I think this is the one. I talked to one AD a few months ago and they were offering me about 12% on date justs and OPs but they wouldn't play ball on subs and gmts. My questions is, is this particular YM hard to get or extremely sought after to the point that getting a decent price on it is hard to do like the BLNR? I know it's stainless steel but is 15-20% unrealistic from an AD? I am also curious as to the re sale value, are they like subs that hold their value or do they take a sharp hit like explorers? Thanks for all of the help, I can't wait to join the Rolex family!