The investor Warren Buffet likes to talk about "intrinsic value" as being the proper way to assign value to a business. Intrinsic value is the amount of all the cash that a business will generate in its lifetime, discounted to a single, present-day amount. If the cost of buying the business is lower than the intrinsic value, then the investment is a good one; if the cost is higher, then the investment is poor.
To extend this to watches: the intrinsic value of a watch is the sum of all the pleasure you will get out of ownership for the time you own it, discounted into a present-day price. Easy to state, hard to implement perhaps, and thus the (mostly) useless advice to "this-or-that" type inquiries: "Buy what you like."
The value (that word again) that I find here on PPro is the ongoing education in how the tangible and intangible parts of the whole watch can be analyzed, put into context, and assigned value. I have learned about the value of finishing from posts on Dufour and Voutilainen. I have learned about the value of in-house movement creation and integrity from posts on A.Lange. I have learned about movement longevity from posts on Omega, Rolex, and IWC. I have learned about dial, case, and hand quality from posts on Grand Seiko. I have learned about small-scale hand-craftsmanship from posts on Dornblüth and Viot. Great posts and reviews necessarily make value judgements, and like an education in wines, or art, one really should learn the "rules" before deciding to bend, break, or ignore them.
Eventually, though, it is up to me to decide how much pleasure I will get from each of these aspects of a piece and its ownership. But I learn the most when "value" is explicitly addressed. The price is the price: easy to learn and digest. The value is a harder measure to take.
Tom