If you access the link that Dan included in his response below, you will see that your stats page also provides you a breakdown of the views your ad has in the various locations you've selected and you can change these locations in the My Spotlight section of your account whenever you' wish. If you have any specific questions about this, please let us know.
Customer Service Representative
Dan from Trulia here. Your ad has indeed been shown 17,963 times in San Francisco since you signed up for Trulia Pro. That's a lot of exposure!
That said, your ad won't necessarily show every time you go to the San Francisco search page, as your ad will be rotated with the other advertisers we have in that area.
I hear your feedback that you'd like more stats and we're working on providing more detailed analysis on the My Stats page (available only to Trulia Pro customers at http://www.trulia.com/account/stats). Please stay tuned.