I’m probably one of the rare exceptions, that has never done pottery, ceramics, or porcelain work, but have a fair bit of experience loading and firing porcelain many years ago.
And while porcelain is a higher fire, and probably more finicky in getting even heat through the load, it has a lot fewer ways to go wrong that can damage other pieces, the furniture, or even the kiln itself.
I know that even if you expand to include glass fusing, about the only way an individual gets to load and run their own kiln load is to own their own kiln. I will also suggest that for 95% or more of the work here, the current model works just fine.
But, it might make sense for one smaller kiln to be set up for firing classes and individual use. But, expect mistakes to happen. It will probably go through more kiln wash, more furniture, and more kiln damage than the ones doing the committee fires.
Also, rules would need to be set up for what hours of the process the member must be present. I would expect at least for all the hours that the elements are on, but that also suggests that something would need to be in place for how many hours after a fire they have grace to unload? Do they get to leave for meals while their load is still heating? Who decides when it is time to scrape the kiln wash and start over? Who decides if some touch up wash is enough? What if you show up planning to start a 16 hour run, and you discover the shelves need new kiln wash first?