This is just “for what it’s worth.” I have a small ranch in the Texas Hill Country and was mowing myself silly trying to keep pastures looking good while rotating animals on and off them. My wife decided that I needed something other than a tractor and three point mower to do the job and I eventually landed a John Deere zero turn ZTrak-997R diesel mower with a 72” deck. It’s amazing how much faster I can keep the smaller (2-3 acre) pastures mowed. Literally cuts the mowing time in half. The diesel is a beast and it will last quite a long time with a modest level of decent care. This mower was about $20k, but it is a lifetime investment for me and well worth it. However, I don’t know what your budget may be for a mower that will belong to a club. I will say though that I highly recommend getting the largest mowing deck you can find. The 72” deck on the JD is no more difficult to use than a 48” deck, but it’s a heckuva lot faster. I assume that fences and other obstacles are at a minimum on the property, especially given its use. The curing height adjustment on this mower is very quick and easy to use so when you’re cutting the runway you can keep it cut closer than the surrounding areas. Other posters have said to be sure your ability to get it serviced locally is not impeded by an excessive drive and I agree wholeheartedly. However, I’ve had minimal service requirements and usually just order any parts, filters, etc. that I need online.
Given that the diesel motor gets great mileage, qualifies for off road “red” diesel fuel (no tax) and lasts for a lifetime (or even two) I wouldn’t be hesitant to buy a decent looking 2nd hand one if I could find one. I did see one on Craigslist a few months ago that looked pretty decent for $7k so keep your eyes open. You never know why someone may be selling a good mower. They’re not all mowers that have been used commercially.