Kids Care International interview questions

My first in-person interview was very generic. Owner didn't ask many questions except about my background which he said he really liked. From the first interview he said I pretty much had the job, but that he'd like for me to make a proposal for him. If he liked everything on proposal, he said we'd go from there and I could start. He didn't really let me ask too many questions and didn't seem open to them. He saw I had an entire sheet of questions ,and didn't open the floor to answering them. Almost as if he was avoiding them. I wrote my proposal and met with him again the following week. He said it was good and that he liked it but if I could go into full detail on all my plans(include exact numbers, cost per event etc.) I said no because then I'd literally be doing all the work for him for free. I said, I would have to start working for you already and I'm not comfortable with that. He said okay, I understand. I have a candidate waiting to interview outside so let me review your proposal further and Ill call you. Everyone outside his office could hear everything because he never closed the door for this one. I got a call from him a few days later saying he agreed with my proposal /pay I asked for under the condition that I lower my rate to $15/hr for the first month. It's appalling considering he has never done ANY events for his nonprofit so you're essentially building it from scratch. I still agreed BC I was confident he'd love my work. He asked me to start working even though he never sent any official new hire paperwork. I requested official new hire paperwork and he asked if I could draft something for us. I did. When I sent to him, he changed EVERYTHING he had been saying past two weeks and had the audacity to say I had no experience and was going to look elsewhere. I'm convinced he's trying to scam people/ get free work. Why is it the minute it was in writing he backed out? It's awful that he did that. Shady! Unprofessional. Unbelievable.