I am watching my friends kids (2 and 5)...I pick the older one up from KDG and do all the feeding...I provide everything except for diapers. I take the kids on field trips to the zoo, the library weekly, to go get bagels, and to McDonald's once in a while. (We go other places and do other things, but those are my favorites).
I do claim taxes which, added to supplies to do art projects and food and outings, takes out about 100.00 of what they pay me. (I use organic foods with my kids and do not buy food that comes cheaply in general...I told my friend that it's one thing I wouldn't change if I started watching her kids and I didn't want to make two separate meals). A lot of home day cares save money by using cheaper options...not trying to judge, but I worked in day care for years and I know how it goes.
That all being said, I charge 300.00 a week. I do not make her pay for any day that they are not there...sick or if Grandma wants a day with them or whatever. I'm also very flexible about timing. I also have a degree in education and years of experience.
I think it's all about what you're getting for what you pay for. Someone who is doing the bare minimum shouldn't be getting paid as much as someone who is going above and beyond.
The truth is, if you trust her and she's fabulous and you're really happy with your childcare, that's worth something. And, in my experience, most people are willing to negotiate. It's worth a try!