While most of the time "you board you lose" is a thing of the past, this still happens from time to time. This is why if I am at the top or even close to the top, I always ask the GA if they will come on board to move me up if there are no-shows or wait and board last. You should have received a few miles for this, even on a short hop like this - I would have expected 5,000 miles for this.