That color coding would drive me crazy after about a week. I sort my games by weight, light stuff on the top shelf and heavy strategy games on the bottom, because that's how I actually decide what to play on a given night. Player count changes all the time depending on who shows up, but the weight of a game stays the same, so it's a much steadier system. Plus those labels on the outside of the box just look messy, I keep a simple list on my phone instead and check it when I'm packing for a meetup. The owner at that cafe can do whatever works for his store, but for a home collection it feels like you're solving a problem that doesn't really exist. I'd rather spend that hour playing a round of something than sticking colored dots on boxes.