I can’t speak for anyone else, but I do it so that I can easily enjoy an aged 2oz/50g tin without disturbing everything else that’s aging. You simply cannot do that with jars stuffed with a pound or more of tobacco; once you’ve opened it for a single bowl, you’ve altered the aging process for the entirety of that jar.
Perhaps that’s not an issue if you’ll get through that jarred pound in a month or so. But I’m only smoking a couple of tins a week. The only blends I jar are either bulks or the open 2oz/50g/whatever tins I’m actively smoking.
