Convenient, no end to choice, great sonics and low price - you couldn't buy one new cd a month for that price.
Also, I think some confuse streaming with downloading - different things.
Amazon just announced a lossless streaming service for $12.99 / month, and it's rumored that Apple and Spotify will soon follow.
I just don't get clinging to physical digital media in this age. Vinyl for some, maybe, but that's about it.