Cost Per Subscriber (CPSu) in push ads refers to the amount an advertiser pays each time a user subscribes to push notifications. In the context of generating affiliate traffic, CPSu is significant because it measures how efficiently push campaigns are building a subscriber base for future marketing. Once subscribed, users can receive multiple offers, allowing affiliates to monetize them repeatedly, increasing lifetime value. A low CPSu means acquiring subscribers cost-effectively, which is essential for long-term profitability. Affiliates can then nurture these subscribers with targeted push ads promoting various affiliate offers. Unlike one-time clicks, subscribers represent ongoing traffic potential. Therefore, optimizing for a low cost per subscriber helps affiliates scale campaigns sustainably while maximizing future earnings from affiliate promotions. What are your thoughts on this?