The response of the grand maraji' to your inquiry is as follows:[1]

It is permissible for the person directly involved in selling the goods through real transactions to get his share for intermediation, but in unreal transactions (where there is no true buying or selling) and for those who have done nothing, it is impermissible to get money, meaning that receiving money is impermissible for those who get it just because of the increase in members in a pyramidal scheme, regardless of whether it is by the means of presenting goods, services, collecting membership fees, marketing or other similar methods (domestic or international and regardless of under what title or pretext).