Buuuuut ... is that slightly chicken and egg, though?
My guess - and it's only a guess - is that the ZP5 is niche enough that it won't be around new for much longer. But the niche appeal means there'll likely be a small, but present, secondhand market - hence meaning that buying one now is a bit of a win-win proposition.
And if you thought you'd ever want a scope in that mag range - well, apart from the reticle itself having all of the benefits that it has, with the Rokscope variants (and the RS1.2, to an extent), then you'd end up with a family of scopes for various applications that will all feel fairly familiar - rather than having to reorient to quite different reticles each time.
It's also worth remembering that few people who are more on the 'glass is very/most important' side of the house raved when the ZP5 came out (a couple of notable people on the Hide, for example). And, conversely, some who are on the 'glass comes well down the list after durability, usable reticle, etc', such as Form, have commented on the glass on the ZP5 when they might not otherwise bother and/or notice so much.