I guess I misstated my question which really should have been why do you feel the home team has a decided advantage in OT? Just because the home team has won 54% of the time doesn't necessarily make it an advantage. I suppose you could say that having the home crowd would be a slight advantage, but that's about the only thing. I would suspect that whoever scored last would have more of an advantage since they should have the momentum. I just don't think being the home team has much of an advantage in OT, certainly not a 'decided advantage'.
I should rephrase my point so it is a little less confusing or misleading. When I say the home team has a decided advantage, I mean an advantage strictly from being the home team. By choosing OT, you accept that disadvantage. The home team usually wins, and you're basically challenging the home team to a sudden death short game.
If you choose to go for 2, you nullify that advantage for the home team. While home field will make a difference over the course of an entire game or overtime, it's not going to make a difference on a 1 play, 2 yard, convert or go home situation.
I'm just surprised that many of us buy into conventional wisdom so much that we actually feel that making a 33 yard field goal, winning a coin toss, driving down for the winning score, or stopping the other team from driving if they win the toss, on the road against the #1 offense in the NFL, is a better proposition for us than simply putting in Aaron Rodgers hands and asking him to somehow get it in the endzone from 2 yards away.