TNA gets a consistent 1 rating on cable. If what they pay for a 1 rating is better than what they would pay for a .3 rating with a Charles in Charge/Joanie Loves Chachi block, then they keep TNA. If not, you'd have 2 of the greatest themes in television history on Spike.
Its used to describe how much money a worker is giving the fed. However since none of us actually know how much money they make for sure its totaly useless. For instance Hulk Hogan was a Huge Draw due to the amount of shows he sold out.