Sales pitch Ideas for WordPress as a Business Solution

Hi,
This is a business related question. I’ve been using WordPress for more than a year now and I want to use WordPress as a CMS solution to clients.

How are you promoting WordPress as a web CMS or Business Blog solution to your clients?

I am trying to find sales ideas in promoting WordPress as a solution and comparing it side by side with other products like MS CMS, Vignette, etcc…

Recently I met a client who did not want WordPress or any other open source as a cms solution because the product has no support. They said its not an Enterprise Solution compared to an IBM or MS CMS.

What is your sales pitch when selling WordPress as a CMS or business blog solution?

If you have samples of large traffic sites besides Techcrunch.com.

Thank you…