There are some people in the German Xenforo Support Forum who would purchase/pay more than just a license. Right now a small group is thinking about winning a developer for a completely new implementation. That probably won't work, but the will (some money) is there.
Very often used maps in Xenforo 1 were the map by localhost as well as the map by Crispin. The latter is running on my forum. I switch to Xenforo 2.1 in spring and would then be without membermap.
Why? Although it is not clear, the automatic entry of the users into the map is possibly problematic concerning GDPR, at least however it does not please all members. So I may not be allowed / willing to use yours.
So it would be great if your map, as the only current serious option for a map for XF2, could allow users with a checkbox ( or even better, like Crispins map ) with an additional location field to decide if they want to appear on the map.
What do you need to realize this function, please? I would go "collecting" to inspire you.
Your map could become THE ONE Xenforo2 map if it really gets started and builds up a lead. And of course, as
@Sperber writes, the map can and should become fee-based to pay the costs. In order not to endanger your user base, you could possibly offer two branches - a limited solution like now for free and a more complex one with desired functions. The latter might cost $ 30-50 if it becomes really powerful. Maybe your bill will fit.
But in any case: thank you for your map for Xenforo2!