Yes, convenience is important, but Spotify also appeals to certain groups which can't reasonably be served by physical media distribution (and individual song sales) at all.
I use Spotify to listen mostly to classical music, and I might want to hear something performed by 10 or 20 different performers. There is no way I could afford that by buying "songs" individually.
As a side note, Spotify treats classical listeners horribly, ignoring their requests (such as to show more of song titles, or search by label), which I do not understand, because these are the customers that would most likely pay a premium to get better features.
I use Spotify to listen mostly to classical music, and I might want to hear something performed by 10 or 20 different performers. There is no way I could afford that by buying "songs" individually.
As a side note, Spotify treats classical listeners horribly, ignoring their requests (such as to show more of song titles, or search by label), which I do not understand, because these are the customers that would most likely pay a premium to get better features.