Should I just set a minimum job cost at say $500 to cover this incidental time? I had a $200 job that after the job was over I spent 2.5 hrs of phone and email time that they refused to pay because it wasn't in my verbal estimate!!! Hardly a profit there. Well sure it wasn't in my estimate, they asked for a price to do 'x' and I end up spending way more time dealing with the parties involved than just doing the calcs. Do any of you deal with this?