I have taught classes for my guild and considered it a privilege to share a skill with them. I did not want to be paid, just thanked for doing it. I believe it is a contribution to the overall effort of the guild. The officers and committees serve without payment and they work hard. Others do the work of charitable projects without payment. Now, sometimes, we have outside people and noted speakers and teachers come and that is a very different thing. We pay them, provide housing,etc.