you speak of &quot;the only costs&quot; as if that&#x27;s negligible. The eurucamp - a small to moderately sized nonprofit conference - had an operating budget of close to 90.000 euros in 2015. If you&#x27;re interested in a breakdown of costs, they did a blog post about it <a href="http:&#x2F;&#x2F;blog.eurucamp.org&#x2F;2015&#x2F;05&#x2F;24&#x2F;eurucamp-finances&#x2F;" rel="nofollow">http:&#x2F;&#x2F;blog.eurucamp.org&#x2F;2015&#x2F;05&#x2F;24&#x2F;eurucamp-finances&#x2F;</a>