I understand the reasoning behind this process, and I'm not griping about it..
That being said, however, it would make more sense to do it if they actually looked at your passport when you went through immigration. I was in a line, didn't have my passport open, and they waved me through. I thought that they would look at it when we finally got to the tables with our name stickers on them. . .Nope. . .just picked up the sticker so they knew we went through immigration.
A lot of good going through immigration did that day.