^ another simple thing...
because everything that you all said corresponds to reality imo, one would wonder why tho only idols/group's CDs sell instead of the other ones...
Idk about other groups but for akb for example is because they put this thing to vote your favourite member inside singles/album so that it can top the tournament where they choose who should take the highlight into the next single. So the more you buy the more votes you have. Hardcore fans will eventually end up buying all of their editions (usually four)...and also because of the variety of the material inside (ex. different subgroups/girls singing different songs into every single). Plus they do a lot of handshake event and things of the sort, even hug events when fans go to meet them and buy the single XD and many many other promotion stunts like this. That's why they get this incredible number of copies sold. It's just a good marketing strategy, really...
I really like AKB very much but I doubt they would sell THIS MUCH without such strategies. Maybe digitally like any other artist! but the need for physical copies is because of these reasons I listed. That goes for every idol group I think...
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