If it's steady, with a good historical result, type-in traffic, bla, bla you can expect a name like that to go for $1M-$1.5M (yes millions) ;) (3-4 years in revenue to say the least)
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Maybe the owner of YourDomain.com is one of such a big earners :D
Too bad I always click away directly when I see a parked page...
Greetz