Why was there no Eubank - Benn 3 or Hagler - Hearns 2?

I remember Tommy got a bonus for knocking out Shuler in four rounds or less. That was supposed to help promote the 2nd fight. I was really looking forward to the rematch, but in retrospect Tommy may not have fought after that, and Hearns career could have shortened which would have been a bummer because Tommy was boxing to me.