In the last weeks, two peoples had bought a domain via Dan.com for 3k and 10k but after that they refused to pay them and waste my time. In my country, a deal is a deal and a handshake or a word counts the same as a contract. In court, this even has consequences if this is not respected. But in domain trading people don't give a shit about contracts and that is frustrating. Do you often experience that buyers don't pay for the domain or don't stick to contracts?