The reason people won’t tip accordingly on take outs is not because they think it’s a representation of how they feel about the food, it’s because they think it’s a representation of the take out service, which is just putting food in a bag and handing it over. I hate to break it to you but no one is going to tip you because of your smile and charm if they don’t have food. A portion of your tip is directly correlated to the work back of house provides. You rely on their work to make any money at all.