When UFC parent company ZUFFA bought Strikeforce, quick examination of previous promotion purchases indicated that the UFC was probably going to eat the good parts and leave the rest in the trash. When the UFC bought the WFA, Pride, and even after time the WEC, the best fighter contracts were taken, and the promotion itself ceased.
And the WFA, Pride, and WEC were the lucky ones. Other competitors, like the IFL, Affliction, and EliteXC simply closed the door and turned off the lights.
Many expected the same treatment for Strikeforce, but at least for now, the promotion is going strong. This is due largely to a deal with Showtime Sports. No broadcast partner, no Strikeforce. Now Strikeforce has signed a contract with Showtime, and the promotion lives.LINK