My 2 outdoor ft ranges are £35 (Range fee £3, optional to upgrade to no range fee, think £50) and £50 no range fee.
My indoor 25yd range is £65 plus £2.50 (I think) Range fee.

Nsra membership which I use to cover my coaching (and will now look into for kit insurance) is £85

I could drop the Nsra and it would therefore drop my cost per visit down.

Max is subjective as a full ft course with 50m indoor range open 24/7 with support amenities on my door set would be worth the other 3 clubs combined at least. But how much wood could a woodchuck chuck if a woodchuck could chuck wood?