On the site I use about one weekend a month for myself and "The South Wales Bushcrafters - Clynfyw Meeters" group we have a voluntary agreement to give £5 per person per night stayed plus the site is kept in a safe and usable condition for the participants at Clynfyw Care Farm to use (we have roughly one day of activities there per week, weather permitting. I work at the farm doing Domicilary Care and teaching Bushcraft, leathercraft and other support roles.
The Care Farm participants also contribute to site maintainance but the owners have donated timber for us to build a huge lean-to, lets us take whatever firewood is freely available (and buy in charcoal from the farm's kiln as well as seasoned firewood when there is not enough "wild wood" around) while we also have access to a square mile of the farm other than our little "home" patch, we can safely leave kit on site, have the use of toilets at the farm - about half a mile away - and I have pretty much free access, personally, if I want it.
The donations go to supporting activities at the farm from sending medical and mobility aids to a sister organisation to distribute in Southern Africa to activities for the Care Farm participants
My other woodland - about an acre - has no facilities apart from wood but I have totally free access for me and my buddies. I used to pay a couple of bottles of home made wine per year (from the sap of their own Birch trees!) but the drinker of the pair of brothers who own the woods died and the survivor is not interested in any payment now. These woods are about 1/4 mile from my door and I drop in every time I walk around the village and weather and daylight permitting, I stop off on my way to work every working morning, for about 15 mins.
At both sites I can leave basic kit, but less gets left at my local woods as there is nothing to stop anyone wandering in ... not that anything has gone missing or been damaged yet
One site owner is my boss, one my next door but one neighbor on one side of the lane (although 1/4 mile away) the local Taffia see that nothing is amiss and any "unusual" activity is reported
I guess that I probably have the best deals in Bushcrafting sites around