It blows me away that 1outof1.com has no value. I am guessing too many digits, numbers combined with letters and starting with a number. Anything else I'm missing here? Seems to me the uniqueness of the URL would give it substantial value.
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I use if for my domain name selling site. It describes the rarity of a domain name as being one out of one, no other match. I also have KillerURL.com and KillerURLs.com