IT doesn't seem to be a universal thing at all. Just searching for the word "drama" and sampling the text placement on the front cover, it looks like about 75% of the albums have drama CD at the back instead of the front.
Though there was rather contentious discussion about it last year, I think we've been tending to title our albums after the wording on the cover, rather than the obi or spine. As such, there are some albums like the Persona 3 dramas where the Drama CD should be removed from the front and added to the back, but I don't think we should make it a requirement that Drama CD always be put at the end of the album regardless of position on the cover just to make the browsing easier.
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