It's simply the multiplication affect though, store all those formats and you have around 900MB, store 320 mp3 and you have 150MB. So no matter how much storage it actually takes, it takes 6 times as much as needed to serve 95% of customers perfectly adequately. As a business, why would you voluntary have that overhead? Why buy 6 times more storage than you need?
The only way is if offering it pays for itself, and it's such a small number of users prepared to pay it so the premium over mp3 will be relatively large.
Or you just offer 320MP3, OGG, FLAC and nothing else


Boat? Ship? Lamp? Fork?