I have to pay $50.00 to fill up my tank with gas sometimes. That's not very much these days. However, there is absolutely nothing wrong with letting an "employee" know what is expected. Its just business. Sometimes people receiving a small amount think they don't have to be reliable and that anything they do is ok. You really want even a volunteer to be regular and reliable. Nothing wrong with letting them know thats what you want, even if you are reduced to taking what you get. I don't think I would be disturbed at receiving such a contract. I would just consider that they had placed the ball in my court. I could play it or not.