I think it is not worth that much because it has appeal to a very small market.
Plus, it is gender (man) specific. Would be a better sell as a non-gender name...SecurityPerson.com
It's just going to take someone in that field to see it and want it.
How to get it in front of them to see in the first place might be difficult.
But, one place I would look is perhaps some online detective sites, security services site, or similar (IT security sites) and see if they accept classified ads on their site.
I have seen some sites that have a classified section. Typically you have to join (if its free that's great) so if you have free membership then it may be worth getting it in front of the eyes that need to see it.