The main reason Mike added this message system is because sooooo many people would say they never got the email from either a seller or buyer. Mike had heard this I'm sure more time than he cares to count and most of the time it is an excuse on the non-replier's part. This system was so there would be a record of the contact. It is a good system if people use it, but some don't know how. Part of that is because some don't read the "do not auto-reply" part of the message. If I send a message through the LA and don't hear back I will send another. If I don't hear back on that one I will send an actual email since the buyers email is on the invoice.
I think the second most used excuse for not communicating, etc is that their internet was out. That could very well be true but when I see you bidding on the auction yet can't shoot me a quick note to let me know something it is so irritating. I have learned the ones who buy too much and then will take awhile to pay and they are good for it and I tell them as long as they communicate with me I am fine with them paying a little at a time.