What are the reasons NOT to upgrade from a normal Google account to a Google Plus profile

You should use the "Contact Us" form from your profile page and ask for your profile to be reviewed.

Found this on the Google+ support forums:

If your profile has been suspended, rather than start a new forum thread to request an appeal, use our contact form linked from your Google profile or visit http://www.google.com/support/accounts/bin/request.py?hl=en&contact_type=suspended. We don't currently have an option to check the status of your appeal, but our support team reviews each profile. This may take some time, and we appreciate your patience.

If your profile is suspended, you will not be able to make full use of Google services that require an active profile such as Google+, Reader and Picasa. This will not prevent you from using other Google services, like Gmail. Your profile can be restored by editing your name and submitting an appeal that will be reviewed by our team, as directed by on-screen instructions.

Here's the official Google policy on names in Google+. (Actually, it is, by extension, their new Google Profile policy, as you can't have one without the other.)

Basically, you need to use your name as you are commonly known. My first name is "Albert" but nobody calls me that, so I use "Al".

Their rules:

• Your common first and last name in a single language script. Leave of the "Dr." and ".jr" and use one language
• Nicknames and pseudonyms need to go in the "other names" field
• No unusual characters (★, @, etc.)
• Your name must represent one individual. Entities should use the Page feature
• Don't use someone else's name
• Names can be changed only once every 30 days

Get all the details at their official policy.