Misunderstanding

Taught my collage course at the Crafts Museum today.  At the end the Museum rep thanking everyone for coming and then thanked me for volunteering to teach the course.  Say What!!??  I had thought we had discussed paying me $100 for the three hour class.  The rep said she would have to discuss it with the curator, and I may or may not get anything.  But in the back of my mind I find myself wondering if this might be the excuse I use to end my relationship with the group.  And I don't know where that thought has come from, as I don't think I had been consciously thinking in that direction.  Must be Freudian. Have to think about that one.