I have a feeling that you're referring to selling johndoe.com to a guy named John Doe.
Good theory, in that you have what they want, and therefore, they must pay.
Not such a good theory, in that...
- you could not prove "legitimate interest", nor disprove "bad faith" in a UDRP
- most realtors I've found hate the concept of paying for domain names at all. They go off on tangents about how it's a "reputation business", and that you can't buy a track record. I think they'd be just as offended at buying their own given name.
Have a look at what Hover.com does. They lease email addresses and subdomains of surname domains that they own. I'm sure you could develop a similar business model here.
What was immensely frustrating for me some time ago is that my name (Maxwell Arnold) is owned by Maxwell-Arnold Farms, in the .com.
In this case, I could never win against them. Because they clearly have a legitimate interest in it.