What to do?

[MsBell]

I really appreciate everyones input on this, at first I just found it annoying, but as I have thought about it more, I have to agree that I simply have to start taking a deposit in order to hold a spot.
To elaborate some more on the agreement, we had our interview, and I explained that I do not ask for a deposit to secure the spot, but that once we have a verbal agreement, I would stop interviewning other parents and the spot would be theirs,and because she didn't have a position yet, I would hold it as a full time spot, and if she ends up only needing a few days a few, or different days (as a supply teacher) then that would be okay. She emailed me back and said that they would really like to have their child come to my care in the fall, and that as soon as she knew what her schedule would be, she would let me know. I responded, that I excepted her child, I would hold the spot, and to keep in touch and good luck with her search for a local teaching position.
Perhaps I am assuming too much here, but I honestly feel like she has been dishonest with me. If she wanted to shop around some more, she should have just said that they want to see if they can find someone that can take both kids, but if the spot is there in the fall for her younger child she would be interested in it.
I am going into my 10th year in daycare, never had an issue with this. I feel like if they are not good on their word, I'm not really interested in working with them anyway. However I agree, that this business is a business, and I guess in the end, money is the bottom line!