I found it too hard to answer the questions sorry.
A box of awesome characterful minis I want to buy as painting pieces is different to roleplaying minis is different to need a unit for gaming purposes, and there as sub-categories within each.
Similar to DR, I've bought a boxset for a model that perfectly suited an NPC in an RPG campaign I was involved in. I didn't much care what the price was. If there is a rack of discounted minis, I'll check it out for something cool I might one day get around to painting. Gaming pieces have a fairly well set price point, varying by material and game scope, i.e. skirmish, warband, army.
The short answer is everything depends.
I think collecting/painting pieces that can be used for gaming would be the way to have a good price point as well as volume. Totally projecting my own preferences of course. I've no idea what the market as a whole is going to respond to.