It all depends on who you're dealing with. I was selling a TSPP which had to be shipped to the next state over. The price was agreed upon, but it took a while to setup payment to where we both were comfortable. During that time I had a local person contact me to buy the TSPP, but I could not in good conscience take the local deal while the other deal was still in progress. Don't get me wrong I wanted too as it was much easier, but a deal is a deal to me. I want to believe a handshake means something, it certainly does to me.