Some domains are a good buy at $8 but a bad buy at $100. Other domains are a good buy at $2000.
Let me paraphrase Adam's original question the way I'd phrase it to myself:
1. If the domain's SLD phrase has zero CPC, can you put a dollar amount on what "Global Phrase", [Global Exact], "Local Phrase", or [Local Exact] would be worth to you? In other words, what price will make SampleDomain.com a good buy for you? Let's say [Sample Domain] receives 100,000 exact searches in the USA monthly. Knowing this, would you feel happy buying SampleDomain.com for $100? Would you feel less happy but still buy SampleDomain.com for $200? Then, to you, local exact searches by themselves are worth 0.1 cents or 0.2 cents.
2. Which type of search statistic do you use? "Global Phrase"? [Global Exact]? "Local Phrase"? [Local Exact]? Does it vary depending on the domain? How does the value of each type of search rate in your book? 0.1 cents for [Global Exact]? 0.03 cents for [Global Phrase]?
3. How do you alter these valuations when there is a non-zero CPC associated with searches? Obviously the rate per search must increase. But how do you quantify it?
4. How are the numbers affected by language?
5. How is the valuation affected by the TLD? Suppose we're talking about .org, or .net, or .co.uk, or .ca?
Notice, these valuations are as if buying the domain sight-unseen--without any reference to the domain's meaning, brandability, or the prevalence of potential end users.
I'm not discussing the metrics I've developed for myself because I buy from people on this site. But this is how I would ask myself Adam's question. Maybe some of you would like to answer the questions I've posed.
(P.S. Lest anybody think otherwise, search stats do not define value. They correlate with it, yes. But my two most recent sales were for hand-registered original domains that do not receive any phrase or exact searches whatsoever.)