If you really do not wish to make a profit - a mindset that is becoming all too rare, and merits every respect, and certainly has mine! - you could consider setting up a club rather than a business. However I recommend you do make some kind of charge anyway. Apart from covering your expenses, the main reason for this is that most people show more respect and gratitude for a low cost service than for a free service. I never understood this, but have experienced it quite often.