I am a private tutor and charge very good value rates, am very accommodating of parents' changes of plan (ie don't charge to cancel!), travel to tutees etc.
However I am starting to feel taken advantage of. I am constantly asked to provide lots of homework, which takes a while to plan, and given no extra thanks for this. I am also constantly asked if children can have lessons throughout summer hols - I am very flexible but because of this it is assumed I am free constantly - I do have a life too!!!