Yes, you can refer other affiliates to the Pips Markets Affiliate Program and earn commissions from their networks as well.
You are rewarded on three levels:
From Direct Sub-Affiliates (2nd level), you earn $3 per lot based on the trading activity of the clients they refer.
From 2nd Level Sub-Affiliates (3rd level), you still earn $2 per lot from the trading activity of their referred clients.
This means you can build a multi-level structure and earn IB/Affiliate lot commissions not only from your direct clients, but also from the clients of your sub-affiliates on level 2 and level 3.