So, why do I do it? Good question. I ask myself the same thing. Don't always come up with an answer, but this helps:
Luckily, Lilah (and Jak and Eva) love to look at photo albums. I let them each grab an album from the shelf and they get so excited as they turn the pages, recognizing people and themselves. As Lilah has gotten older, she actually seems to recall some of the memories - or at least I tell myself that. Before we go see friends or family that we haven't seen lately, I always pull out a book and we talk about who they are.
Lilah really appreciates looking at all these photos we snap, and I hope that never fades. I know that I still enjoy sifting through albums of my childhood and talking over them with my parents. Every photo means something different for them than for me. Like, I remember my incredible 5th birthday and the awesome bike I got, while my mom remembers slaving away on my Rainbow Brite cake up to the last minute before the party.