Didn't Freespace 2 release a month ahead of the scheduled date though?
It did. I don't know what happened with Klingon Academy, but the FS2 folklore goes pretty much like this:
1) Interplay put pressure on Volition to release FS2 a month early so they could include it in their quarterly report
2) Volition pulled off a minor miracle and managed to successfully do that
3) Interplay forgot to tell their marketing people that they wanted FS2 a month early, so FS2 was released with no marketing
4) FS2 spent a month on the shelves with no marketing and little notice
5) When the original release date arrived and FS2's marketing was
supposed to kick in, Interplay decided to cancel the marketing rather than "waste marketing money on a game that wasn't selling"
6) The "mission disk" that was going to be released for FS2 (like Silent Threat for FS1) was also cancelled.
Opinions differ on what happened next. I remember hearing a rumor that the marketing budget was subsequently embezzled, but I can't find a source for that.
Despite all this, the original FS2 release turned a profit. Not a big profit, but a profit nonetheless.