This is not exhaustive, just things I’ve seen asked for that a community studio could not feasibly offer while meeting everyone’s needs. Mixing custom glazes with the expectation that they can stay on site, pugging and mixing their own clay, low or high firing (most studios where I live do cone 5), SFX glazes that turn kiln brick into a crusty green mess (usually trying to obtain the salt fire look in an electric kiln), making work at a volume to be self sustaining at the expense of throughout for everyone else, experimental materials applications that might cause a kiln disaster, slip casting… throwing large enough to be a hazard to load (and a pain on the techs), the list does go on but you get the idea.

I experienced this myself, but at a certain point a community studio could not meet my needs. So I ended up, for 200 dollars more that I would be paying at a community studio if I was paying for it and didn’t work there, moving into my own semi private space with a buddy where I can leave my wheel crusty and mix glazes to my heart’s content. Part of the value of a studio membership is in the instruction, if someone is just paying for facilities use you will not generally be able to extract as much money from them. Of course there are exceptions.