7 or so a year, now finishing my 3rd year .. not so impressive, really.
But as you infer/know running a business, as you get older, other real-life obligations by necessity make it quality time, not a matter of quantity.
Cost of gearing up vs Attendance ratio is way pear-shaped. This sport easily eclipses motorcycling (my other money-sink in the past) in terms of the $$ vs activity ratio.
I only regret that it wasn't around/or was only very small-scale niche, when i was 20 years old or so..