OK that was misleading.
The artists, sound and light tech obviously get paid. DJs get around 50€ per set, bands 200€, technicians 70€ per night. No one who lives off their art performs there, except sometimes as a favor cause they like the place. It's very much a stage for hobby musicians. The money pays for their cost to get there and back, and they also get fresh-cooked food and a place to sleep.
The bar and door are staffed by volunteers who get free entrance and drinks, and the venue is managed by volunteer members, who get to hang out there whenever they like, at a very unique place.
Entrance fee is between 5€ for an 8 hour event with only DJs, to 8€ for a night with 3 bands and 2 DJs. A beer costs 1,50€, soft drinks 1€, long drinks 4€. We are very much running the place at cost, so everyone can afford to go there.
It only works out because of the massive amount of unpaid work done behind the scenes, lots of connections to professionals willing to help out for free cause they like the place, tax-exempt status, a special deal with the local brewery, and relatively cheap rent.
And the capacity is 300 for the main stage. Together with the second stage, outdoor stage and bonfire area (if the weather is good), we can let in 600 people.