sometimes it just comes down to timing, and who messaged first. I- like many others - will respond in the order i get messaged. If a deal is struck great, if we don’t agree to a deal i will move to the next in line. Sought after games for good prices typically don’t last long, so best be quick and not mess around if you hope to land it. However i will reply to all messages regardless but not everyone will, especially if they get a lot of pm’s. Don’t take it personally if your pm goes unanswered, theres will always be another pin to buy (trust me lol).
If someone is willing to come to see the game in person, how long you have been a pinsider is less important. If you want a game shipped, Pinside rep becomes very important to me. I think most people will give preference to a local, hassle free sale though.
Best of luck!