I beg to differ. A first basman can cost you lots of runs. Example: How many times have you seen a shot donw the right field line, Millar his bellyflop dive in vain to try and catch it, a guy rolls into second in scoring positon and you sit there thinking damn Olderdude would have got that.
How many times have you seen someone need to rush a throw from the left side of the infield and instead of doing the right thing and coming off the bag and trying to do a swipe tag, acrobat Millar thinks he can stretch enough to get the ball and stays on the bag. The ball goes by him ends up in the stands a guy once again rolls into second base in scoring position.
How many times have we seen a weak nubber on the infield grass that the first baseman plays, the runner is sprinting down the first baseline the pitcher running to the bag to cover. The natural play is to flip to the pitcher, but Millar in his constant state of being stupid, tries to make a dive tag at the runner, misses and a guy is now on base.
The first baseman plays a key role in the defensive part of the game and Millar playing there is a constant liability on the field which is why Olerude should play as often as he can. Not to mention Millar can't hit either.