>>2809101
I had to line up at 7:00 for Comiket (which is 2-3 days in a row) and usually left at 17:00, backpack filled with porn mags, sweaty, tired and sore from being shoved around by waves of otaku all day. The last thing I felt like doing was go to a restaurant.
The taste and diversity of selection in konbinis is so much better than my home country though, it was a delight to taste so many different things. If you live there all the time you get bored of it eventually I guess, but I was just a passing tourist so even convenience store meals were fun.