Last week I SDC'd to an earlier flight on BOS-ATL eventually going to BDA. I was standby and got the last seat on the 6am departure, it was a middle seat. In the past when I have done this I often get a 500 mile post (non-MQM) on my account for having to sit in a middle seat in economy. This time no such post. Is this just a random occurrence or has this been discontinued.