Maybe that market in particular is narrow enough that the competition would be seen as harmful.
Highly possible. Soundtracks were the first music genre to go CD-only, and then download only, putting many specialist soundtrack shops out of business.
I've bought over the last few years. I have the date on both my phone, and my watch so I don't need a calendar to keep track of the days.
I've always bought all of them since 1980. I realised the other day, I hadn't turned a 2012 page over since March, so yeah, I rarely refer to my wall calendar these days.