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.
There are a lot of positives about TNA's business approach thus far. They've started local, much like ECW and all other indies before that, they've developed their home turf, where every week you can come see them for a very reasonable price.