While TG as an attraction really doesn't fit with the enthusiast nature, i think there's a reasonable amount of crossover.
Growing up in Penrith, a trip to Panthers was a rite of passage. It was also a destination for many Wonderland cast after a long day \ week (and many cast parties \ after parties \ christmas parties were had there).
Inevitably, at some stage through the night, a trip to AquaGolf would be in order. AG was outside the licensed area though, but people still belted the shit out of a few buckets before they sobered up enough to head back to the bar. (Or in some cases, used that time to sober up before driving home).
In this regard, I can see TG appealing in the same way. That said, outside the 'small group of blokes' i think it has some appeal - many theme parks \ amusement parks have mini golf, or similar. I don't think its as niche \ outside the box as you think.