There are many factors that go into the Price of any item. Cost to design, produce and sell a product includes materials, labor (which includes location) and mfg overhead (which includes product design) and general overhead (which includes marketing, sales and admin, etc.) then you have to add on both required/desired profit to get to Price.
Historically, for most manufactured products those costs related to actual production (materials, labor, and mfg overhead) have been ~20-30% of the price overall industries. So note somewhere between 70 and 80% of the price is unrelated to the actual cost to produce.
There is not always a direct relationship between quality cost. Three factors that most people don't consider about why the price of product is what it is are 1) Profit desires, 2) expected number of Units sold), and what I would call the Psychology of Pricing as it relates to human behavior.
Profit required and profit desired and expected number of units - if I have two scopes that cost the same to produce but the "market" (expected units is 1/2 that of the other) the profit portion has to be doubled to meet required/desired return on investment. Even though the market may only be 1/2 it doesn't mean the product will die if I can get the required price.
The Human psychology part of price and buying decisions ("buying status", "buying to remove reputational risk", or "buying for to ensure job security") can fill books and their is an entire consulting field on it. Anyone who doesn't think that plays into outdoor products is naive. It even plays into military purchases where you think it wouldn't. A simple example is cars - Mercedes, BMW etc sell anywhere from 30-50% more than a Toyotas and Toyotas out perform them on many of the most basic specifications. With respect to military acquisitions where someone's life is on the line, think about the various scenarios we have read about where controversies have arisen where the best performing product wasn't selected and contrary to popular belief the government always doesn't buy the lowest price product - that regulation is easily circumvented.
Not saying a $500 scope is as good as $1500 scope but it would be incorrect to assume a $1500-$2000 scope is factually/technically/mechanically twice as good as $750-$1000 scope.
All products sometimes fail and whether Product A's failure rate is 1% and Product B's failure rate is 3%; it doesn't matter when you are in the 1% of Product A customers who had the failure and by the way there are very few rigorous statistically valid tests for outdoor products.