Amen Kermie, you've got it in one. The actual poling the aircraft and interacting with the students, I love it, I could do it forever.
However the constant staring in the face of financial ruin, and the totally contemptible you-are-a-low-cost-commodity-to-be-screwed-for-all-you're-worth approach taken by flying school management in many places, makes it a bit harder to swallow.