They are trying really hard to keep player choice out of the auction process (other than favs/bans), as in the past, player's having the ability to choose which team they are on has left "weaker" elements in a position where they cannot get strong players (who would rather be in "better" elements).
Under the current system, even if you get "sniped" at the end of this OT, as long as zawadx can pay the extra 20 points for the increased overtime charge, he can get you back in the next OT.
The limit they have now added is that if you do not get bid on during the 4th overtime, you will stay on the team you were on during the 4th overtime. (or if you were bid on in the 4th, but not bid on during the 5th, you will stay on the team you were on during the 5th overtime).
This will lock in a lot of players to the teams they are currently on, and greatly reduce the amount of options for going forward, which will drive up the price on those options quickly, and thereby end the auction sooner.