the whole point is that they didn't LOSE out on it. They won the bid.
sure, if I bid on the move from an inside to a balcony for $400 total (as I did with Princess), won it and it was then taken away, a couple of hundred dollars of OBC would have been a nice consolation prize. However, OP paid more than $5K (that's more than I pay for any cruise for the 3 of us) for the upgrade, won it, lost it and then got a measly $200 consolation OBC. I would be very upset.