There are predefined commission rates when selling products on the Marketplace. When you submit your product to the Marketplace you can decide what plan your item will belong to.
When you sell your item exclusively, your commission rate starts at 50% of your sales revenue. As your item sales increase, you will also increase in the percentage of the profits. The exclusive item structure rewards the sellers that put in the extra time and effort.
When you sell your item non-exclusive, the item is stuck at a static commission rate of 50% of your sales revenue. With this option, you are free to distribute your work as much as you would like.