Correct me if I'm mistaken, but even if it becomes a paid service, you might still have to wait for other paying customers to leave? Unless right now there is a problem of people taking their sweet (inconsiderate) time in the parking spot since they are not getting charged?
If that is the case, some HN posters had an interesting theory: once some customers start paying, they might feel entitled to stay at a charging station even longer (which would not fix your issue of waiting forever to access it).
Hope your charger gets fixed soon!