I actually look at the contract as a two way street. I try to spell out exactly what I will do and what I don't do. That way they know what to expect from me as well. So far, I have had nothing but good dealings with folks. Perhaps charging helps weed out some of the rif raf. I have some people that think I should do it for free, so I politely move on. The best advice is to go by your gut. If something doesn't sit right with you, walk away. It most likely will end up better for you.