Because they are a quick, tasty bite out of your albums.
When I first signed up, I couldn’t see the point in Lomo Walls, to be honest I still don’t know the history, but as I gain more and more friends and want to digest new people photos, I find the prospect of looking though all those images quite daunting.
Lomo Walls, whatever the original intention, seem to be used by people to showcase their very best work, in a very creative way. I can find out more about a person from their Lomo Walls in a few minutes than I could in an hour of looking through their albums. Which I do when I’ve got more time.
So keep it up guys, get the bricks and mortar out and keep building me walls!