My personal thought is this. Windows fans in general, expect apple quality, at google style prices. Before the phone even launched people were talking about waiting for a price drop. Apple doesn't have this problem, and to be quite honest, neither does surface. It is the one hardware product by Microsoft that they seem to be firm on charging a premium for, and as such, people pay it. I expect when the next phone launches, it will be much the same, unless it is a total flop. But as fans, we ought to be willing to shell out something to keep our ecosystem alive, or stop ******** that things aren't fantastic.
The thing is that in technology. you get what you paid for, yes, but you also have a percentage that is "what people value from the product". That percentage increases over time, and rapidly due to how fast technology moves forward. The Surface and Apple product has a strong value in peoples eyes, making the price of the product high, and maintain the high price as production cost reduces over the months due to technological advancements.
The Lumia line, sadly has 0 of this extra value. The brand is not really recognizable or associated with anything, and the material used, while understandable due to wireless charging, and replaceable battery, is so over used in the low-end market, that people associate with it. It has no reputation, especially in North America.
Like showing people a Lenovo ThinkPad series next to a MacBook Pro to a person that doesn't know much computers or have any brand recognition. The Thinkpad you can toss it around, and probably even out the window and fall on concrete (ok well it depends on the floor), and survive. The plastic might break, but the system is fine. A MacBook Pro, will probably not survive very well. But the MacBook Pro feels like a better quality, and despite identical specs, down to the details (say, for example), and identical warranty and after sale service (still for the example), the person will most likely willing to spend more on the MacBook Pro.
So that point (feel of the product) and brand recognition/value, is what determine the price, and if the product is of good value or not.
Now all this doesn't help that you can get a Samsung Galaxy Edge wtv model for free or <~200$ on a 2 year contract, while the Lumia phone you need to cash out 550$+ (make that almost 800$ in Canada) before taxes. So people sees: Oh look at the glass back of the the phone, it feels nice, it looks fancy, it feels fancy/premium. And it is "only 200$" (ignoring that the plan would increase for the phone, to pay the phone).