What are Premium Ads?
Premium Ads will be placed at the top of the list. Visitors will see your Ads first. This feature also places your Ad in the top of the category listings. These Ads get the most responses from people since they are positioned at the most visible spot among all other Ads.
If your premium Ad expires, it will still stay active in the regular Ads list till it expires or you delete it.
Global Ads - Display Your Ad(s) in All Cities to Get Multiple Times Exposure
To make your ads visible in all cities, Select the following check box while posting your ad.
This is how your ad (Global Ad) appear in the list (Marked with brilliant color and a star)
Also check the following: