It is not uncommon to use a low pull rating -- 1 or maybe 2 -- for all starting pitchers, regardless of ability. I believe the thinking is that if a guy gets shelled early there is little reason to call your bullpen and waste innings on a lost cause. Let the guy throw a lot of pitches, call it a day and move on. This, I think, has some appeal: typically a bullpen will have two or three premier players and a couple (or three) support types, and you want your best guys pitching in the high leverage situations as often as possible. Of course in a blowout your AI manager will most likely go to either long relief or mopup, or, if the starter is pulled way early, you might see several bullpen guys used. Whatever the usage, it increases the likelihood that your best guys will be used in low leverage situations because the support staff is recovering from your last blowout loss when the had to cover 6 or 7 innings.
I don't use super low pull ratings for my starters, typically a 2 is my lowest, with 3 my default. But I also like to collect mulitple bullpen arms capable of throwing 120+ innings and who I trust in high leverage situations...so for me the cost of a blowout tends to stress my bullpen less because I am comfortable using three or four guys in tight games. Also, several of my teams play in ballparks that suppress offense, and I play a lot of low scoring games; for me the benefit of higher pull ratings might be to keep the game closer until I get into the other team's bullpen, when I think I tend to have a comparative advantage.