My 2 cents.
One problem I've encountered is that the prospective end-user (business owner/layman) doesn't understand how he would actually gain ownership of this intangible item.
In addition, I also explain the obvious: how owning this name might help their business.
One email that has netted some sales:
Dear,
The premium generic domain name xxxxxxxxxx.org is now available to you for $XXX, less than the cost of a newspaper advertisement. The name receives quite a bit of natural type-in traffic from those specifically seeking information on xxxxxxxxxx (or perhaps seeking your web site) so it makes sense that you should own the name. You could then redirect that traffic to your own site if you wished.
Strong metrics:
-Distinctive & Specific
-Two Key Words
-Googles 266,000 for "xxxxxxxxxx"
-Product category
-Not the .com (which would cost thousands), the .org extension lends credibility & actually works with this name
Transfer would be smooth & fast. I'll unlock the name & supply you the authinfo code. As I'm sure you know, you simply supply that info to your registrar and complete transfer takes about 3-5 days. Payment to me would be via secure PayPal.com (my account is this email address or by check).
xxxxxxxxxx.org will provide you a nice generic presence on the Internet with added sales leads and the $XXX is a nominal price, so I thought you might be interested. Please let me know if you have any questions and thank you for your time.
Sincerely,
Name
Address
Phone number
Email
Internet addresses are like property, valuable pieces of real estate and I believe a premium storefront like xxxxxxxxxx.org will retail in the $xx,xxx range in just a few years.