Membership revenue is the only thing that matters. Nothing else
Fagan has played it well
I think there are two measures of success. Membership revenue, as you say, is the primary one. Easiest to measure, too.
The other one is a bit more nebulous, but it's likelihood of future membership revenue. Does selling more 3-game memberships expose more fans to the side and perhaps lead to an increased demand for 11-game memberships in the future? Or perhaps even just lead to more incidental ticket sales? Hard to really quantify.
Given that we are basically maxed out on 11-game memberships, while Port could still sell more, it makes sense that we have our membership strategy and they have theirs.