Circling back to this - agreed with others that "bias" is the real thing, for most officiating crews.
Except for SEC officials.
I'm sure most everyone on this board remembers the Jasper Sanks fumble. Before that game, the SEC officiating crew for the game at Bobby Dodd was the highest-rated crew of all the SEC officiating crews, and was supposed to officiate the SEC Championship game the following week. After the game was over, the SEC reviewed it, called them all in, gave them a sharp tongue-lashing, and removed them from the SECCG. They went home and didn't officiate again that season.
It's hard for me to believe that taking away the prestige of officiating the SEC Championship Game (as well as the extra ~10% of their season pay from that game) didn't send a sharp message to other SEC officials: if it's a questionable call, call it in favor of the SEC, or suffer the consequences.
Lo and behold, it's seemed for years that questionable calls from SEC officials seem to go in favor of the conference favorite. Who wants to see their livelihood affected if they make a wrong call and keep one of the anointed "favorite" teams out of the playoffs?