Cheers for the feedback. Domainprices.co.uk seems to have stopped being updated and when I checked Edwins list previously a lot of the domains seemed to have changed hands
You have to be careful because many sales are one of a kind.
Many sales are in the 3 figures.
Adapt the sales pitch to the circumstances and peculiarities of the end user.
They already own a domain name - you are offering something better (more credible) than what they already have.
Or: you are offering a domain that will put them ahead of the competition in terms of credibility, brandability memorability etc.
I have sold quite a few real estate related domains. So the sales pitch is simple: just one transaction will pay for the domain, then you have a nice business card on the Internet that is yours forever.
For an end user that pays 5 figures or more in online/offline advertising yearly, the value proposition of a domain name should be a no-brainer. Should.