Daycare Question

I run daycare from my home. Currently I have one child in my care (plus my child) and she has very demanding hours. I've decided to open my other spaces up as Drop-in spaces. I will provide occasional care to children on short notice from monday-friday as long as I get at least 12 hours warning. I feel like this is more of a premium service and I would like to charge (a little bit) more than I do to my regular client(s). Is this reasonable or should they pay the same a regular clients?