Building a cloud

Review the following slide show:

Cloud Computing: Don't Build Your Own Private Cloud in 2012: 10 Reasons Why

http://www.eweek.com/c/a/Cloud-Computing/Dont-Build-Your-Own-Private-Cloud-in-2012-10-Reasons-Why-644122

As the author helpfully points out the slides are provided by a public CSP so they may be somewhat self-serving.  What are your thoughts on the points made in the slides?  Can you think of some rebuttals, whether security-related or not, to the article?  What are some reasons that an organization would choose to build a private cloud? Please write 1-2 pages with your thoughts on these questions.