> I will give a lower price to a customer who I believe to have good character, and I would hike up the price if he is a demanding or difficult to deal with type
Please don't. Your beliefs don't matter. Even the coolest guy can come out as a PITA or a scammer. Or even if he's cool, he can have partners who will make your life a living hell. In the end, it's all about the money. Just charge what you're worth, so you don't regret it.