Keyword Research Help?

Hey all,

I've been trying to create a few new sites, this time using SEO as my primary traffic tool... I followed a great guide here on Keyword research, however, when I am searching the Google Keyword Tool, it's giving me values that just cannot be correct.

For example: Buy Graphics Cards - Apparently this has 140 Global Searches per month. I just can't see how that is even possible. (I am searching Exact Keywords btw)

Am I doing something wrong here?

Thanks!