The secret is out. It’s a myth that the AdWords keyword tool suggests keywords to use. (I’m being sarcastic… it’s been no secret at all in the Internet Marketing community.)
As Google puts it:

Fact: The keyword tool doesn’t make any kind of recommendations about which keywords you should be using. The keyword tool just analyzes related queries that might be of benefit to you and displays them. It’s up to you to decide which keywords you want to include in your account.

Oh yes, the numbers it puts up also need to be taken with a VERY large grain of salt.
There’s a new version of the tool coming out. It’s nicer. That doesn’t make it more accurate.
The only thing we use it for is to suggest POSSIBLE areas of search terms we might otherwise miss.