Remains a fascinating subject, at least for me. Everybody in the world would have tried to catch that ball. Has had multiple opportunities to make big dollars and passed every time. A real fan to boot. I have genuine empathy for the guy.
This. I understand that most people would probably go for the foul ball in that situation. But if I'm a huge Cubs fan (thank god I'm not although I love going to their games at Wrigley), there's no way in hell I'm reaching out over the railing for a catchable ball in foul territory in the late innings of a NLCS game that would send the Cubs to the WS if they win. Heck, in that situation it's infinitely more likely that I would of "boxed out" the other fans besides me to hinder their efforts in catching the foul ball rather than trying to catch it myself.
Insanity. No chance you'd have the wherewithal to think it through to this degree. Instinct would take over. You'd have no clue that it would be a catchable ball for Alou. The ball leaves the bat, looks like it's coming in your direction, gets bigger and bigger, people around you are screaming. No way you'd be able to judge exactly where that ball is going to land. It's October in Chicago. The ball is swirling around in the wind and spinning off the bat. Every baseball fan who's ever been to a game would have put their hands out to catch it.

I have excellent situational awareness. For example, one of my first games at Wrigley I was sitting in the 1st row right behind the visitor's bullpen where there's a nice, flat cement barrier separating you and the ballplayers sitting down on the bench. I had started drinking hours earlier and as I first sat down in my seat, beer in hand, I realized it would be natural to set your beer on that cement ledge right in front of you. That's what most people would do. But I immediately discerned that doing such was not allowed, despite there being no signs that said so, as a beverage could easily be spilled onto the players sitting in front of you, so I didn't place my beer there (and sure enough others got admonished for doing such later).