Tickets won
I didn't get any on the first round of bidding. I did get two tickets to equestrian events (not my first choice) on the second chance sale. I wondered if I would have increased my chances if I bid on more, but from the comments here, probably not.
I was in London for 2016 where I was led to believe that sponsors would return unused tickets. I never was able to buy one. Cosport really dropped the ball in London. Hope Tokyo be better.