Hi fellow daycare providers!

This is my first post here, but I have browsed some posts previously.
I ran full time daycare at max or almost max capacity since 2011, then started just doing part time or before and after school care two years ago.
I was wondering at what point you all would let a daycare child/children go?

I don't want to go into too much detail because I don't want to bad mouth other people's children, but have you/would you stop having a daycare child because they just didn't 'fit' with your family or because their situation/hours won't work as you originally had thought.

My parents and Husband always tell me 'The parents wouldn't give it a second thought if they had a better option come up.' Whether it be financially, location or hours. I have had this happen a couple of times, so I do believe that, but I also am not a person that feels ok about letting people down, so I am torn right now.