There are a couple of things I'd like to share with whoever is interested.
I offer these services on a takoha basis. Takoha is a Māori word and concept. On my understanding and interpretation it means that you pay what you feel it is worth after you have received what I have to give. It is an old concept that was once commonly applied in most indigenous cultures around the world. It gradually finds its way back in "modern concepts" such as gift economy (Schenkoekonomie).