Nice collection! For sure that gold dust Dash looks really great!
I do agree that although I love the Hikari MLP, they don't really "feel" like $50 vinyls. If anything, the MLP vinyl Luna and Princess Celestia seem to be a more complicated sculpt, more vinyl, and probably just as expensive to create.
But then, that may actually be true and the reason why after the initial wave- Celestia and Luna were not really restocked anywhere and seem to have disappeared completely even though they sold well (we have seen plenty of re-prints of all the others).
I am afraid the economics/price of production on Nightmare Moon and Chrysalis might be even higher- and it could be that price of production + Hot Topic deciding not to carry ponies any more- might be why we are not going to see any more large vinyls or mystery minis from Funko.
Well, I hope that Funko ends up producing the rainbow glitter Dash- that is the last one that I want! (I don't need that solid gold one)