Yep. I live in Japan and while I probably (...uh... probably...) don't spend $10 a day at the convenience store, it would be pretty easy. I also go at least once a day. $1 for coffee, 80 cents for daifuku (the best food in the world), $1.50 for yogurt, $2 for fruit... I notice he has a bag of beef jerky in his picture. That's particularly expensive (probably $3 or so).

I think the thing missing from the picture is that convenience stores in Japan are a lot more convenient than they are in many other places in the world. The 7-11 store near me sells vegetables, sliced meat, bacon, eggs, milk, etc, etc. So while it is common to buy months and months of food items from a grocery story (or possibly a yearly supply of mayonnaise from Costco) in NA, people tend to buy small amounts of things from smaller stores in Japan.