In this article sharing why it's essential to focus on ARPU, you discuss how publishers should track reader revenue throughout the funnel, even before a user registers or subscribes. But how can you measure the value of a newsletter subscriber for instance, who doesn't pay you any money directly?
Everyone defines and tracks engagement differently, so which is the best option? I've heard people mention RFV, returning visitors, page views...? And some others name engagement as loyalty instead - is there a difference?