I would only do it for past clients or children I already 'know' in some manner and of course if I had space .... I have done it for some of my part time clients who come regularly 2 days a week but occasionally wanted to pick up extra days and if I had a child away I would call up and let the parent know 'I have a space today if you want' and she would drop the child off ~ she was self employed and having a toddler at home became increasingly challenging .... drop in care can be very hard on some children who thrive on routine or suffer from 'separation anxiety' and the entire day is spent crying and upset cause they are out of routine and well as mentioned no amount of $$ is worth that to me or the stress it places on the other kids