What is the ruling on marketing where the supervising marketer deducts a small percentage from the profit of the marketer whom he introduced to the work, while the larger share of the profit remains for the marketer who made the direct sale?

It is permissible to market permissible products for a commission, provided that the marketer does not pay money to subscribe or is forced to buy. It is permissible for the marketer to deal with sub-marketers for a lower commission, thus taking the difference, unless he is stipulated to market by himself.