A popular business model since ClassiPress 3.1 has been out is charging customers a monthly fee to post, and then up-selling members who want featured ad space to increase visibility of there ads. This is not only possible, but ClassiPress has option built very intentionally for this exact model.
Step 1: Setting Up Membserhip with “Required to Post”. You can choose one of two options here. Require membership to post everywhere, or just require membership to post to certain premium categories. The choice is yours and depends on your sites business model.
Step 2: Setting up pricing to work with “Featured Ads Upselling”. Next you will select the Pricing Model tab and choose to “only charge for featured ads” as shown in the image below.
Step 3: Confirm your general options are setup correctly. Simply check the highlighted fields to match the options show in the screenshot below.
Your options have now been setup for this business model. Don’t forget to setup your membership packs now so that people can properly buy membership subscriptions . When everything is setup correctly, it will redirect non-subscribers to purchase a membership. Once they have a membership it will give them to option to upsell there listing like shown here: