The Retail Classifieds theme is not just any other average classifieds theme. It is mobile friendly , created in responsive framework and is Search Engine Optimised.
The muted blue color give the look simple but elegant looking. It is widgetized where you can add different widgets for your websites accessibility. The theme also has a static in-design newsletter so you wont have to create one on your own. The full width homepage image banner is a great feature for your advertisements and offers.
The Retail Theme is basically the only theme you need for your classifieds website.
So what are you waiting for?