As mentioned HERE, in the 6th Paragraph of our Homepage Site Guidelines.

If you are looking to sell your personal product and/or services, in which you are the beneficiary of said transaction, then you need to purchase an Advertising Account Package.

*You may not utilize the Marketplace or your profile signature line to do so,
without an Advertisement Account Package

We encourage you to purchase an Advertisement Account Package for many reasons that will benefit you in the process of selling your product.

A list of Sponsoring and Advertising packages can be found here. CLICK HERE

For any question on this matter, please contact the Site Administration by
clicking on the 'Contact Us' link at the bottom of this page.

Thank You