Permissive parenting and lazy parenting irks me to no end, one has to deal with their "products" in playgroups

..
I agree with PPs, it might be a bad news but it seems you already know this - find a family who will think ahead for their children more and who will actually need your services.
Maybe you could print some data for the confused folks (
http://www.continuum-concept.org/rea...InControl.html ,
http://www.continuum-concept.org/rea...ngHarmony.html ,
http://www.positiveparenting.com/res.../weblinks.html ,
http://www.loveandlogic.com/ ,
http://www.takingchildrenseriously.c...l_consequences there are so many different ways, just wanted to link a few interesting ones), not only talk, so they realize your mode of operation is for their child's benefit, but how you described them, you might be surprised when you confront - they might ask you to leave, anyway.
Good news is, this is a good place to find work, it is hard to find a good sitter and people will snatch you in a heart beat. Good luck and it is nice to know there are good, responsible and thoughtful sitters out there, we are looking for one in our area ourselves.