DomainsInc, this is where the initial "Register your interest" call comes into play. My approach is:
Hi my name is (Your Name), I am calling from my Company Domains Inc, we are a premium domain brokerage service, perhaps you have heard of us? (they normally say no) Ok, my company is all about matching domain names with new owners, our service to you is entirely without cost as we recover costs from the seller, which brings me to the reason for this call. We have been instructed by our client to auction off the domain name "domainname.com", considering your company's fantastic reputation we are approaching you as a possible new owner of this domain name. Our client has instructed us that he only wants this domain name to go to a company of your high caliber, and a company whom will indeed make good use of it as a long term investment.
Of course this does seem like an odd request, however you must understand that some domain owners treat their domain names as pets, you may laugh but in this business I have seen some amazing things.
I know you are an intelligent man, so I will not insult your intelligence by going into details of how a premium domain name such as this, can make a big difference to your companies bottom line, I have to be honest when I thought about domainname.com, your company immediately came to mind, so you certainly know all about branding and marketing.
(at this point they will either ask you for a bit more information or they will simply agree, either way you have their attention)
Ok, I dont want to take up any more of your time as I have another 30 odd calls to make today about this domain. All I need to know from you is, would you be interested in taking part in a closed auction, we dont need anything from you right now, and dont worry this is not like ebay or anything likfe that. The process is simple, we will drop you an email in the coming weeks with a link to the offer page, you will be able to see what the guide price is, at which time you can make an offer of any amount. We will only ever contact you again if your bid is tied with anothers.
Also if you were to be the lucky winner of the domain name, then rest assured that we will assist with the transfer while also acting as escrow agent for both parties to ensure that the domain transfer is 100% secure, no monies will be released until you are 100% happy and in control of the domain name.
Let me take your email address, and as I said there is no obligation for you to take part, once the auction opens, drop by and make up your mind then.
Great Speaking with you, and I honestly wish you the best of luck.
(now you will see that what I was doing through out was making it all sound like a competition, I was also appealing to their vanity, lots of positive suggestion going on, and this was very much a no pressure pitch. I would then follow up with a well researched email, citing search stats, conversions, and stuff like using compete to compare the company to its biggest competitor..)
All sales are about creating a need for something, creating the illusion of success and that the buyer will get laid more or indeed be richer for taking part in this. I kind drop little comments like, "Owning this domain, is the difference between driving along in your Crysler or Driving an Aston Martin.. people trust names, and people search semantically.. if your company was called Jedsshop.com not many people are going to simply type that in if they are looking for a DVD player, chances are they would type into google something like DVD Players, have a descriptive domain such as DVDPLayer.com really would be the difference between 1 sale a month and 1000 sales a month..
but try not to oversell... especially if you have a client that is interested.. it can often be easy to talk them out of it, but you getting to excited about it.