You can do that using Magento Marketplace Seller Groups module. As an admin, you can set the default no. of products a seller can add, and then define how further restriction applies:
- Number of product listings
- Duration of product listings
- Or Both
Once the duration expires, the product listing will not visible to the customers.
The admin will create different groups for sellers and set a fee for becoming a group member. A seller can pay the group fee using available payment methods on the checkout. Or use PayPal account for making recurring payments for the subscription.
For further query or customization needs, please contact firstname.lastname@example.org