If you're into house/techno/disco all the best records get released (or rereleased) on vinyl first, before eventually getting out as a digital download.

Also for artists, the profit margins are higher selling an LP (or even better a cassette) then releasing it to a small fanbase on Spotify. It's a better way to connect with a band you like than just streaming a track on your iPhone. You get the artwork to look at, and it's fun to read the production notes.

I can't remember the last time I bought an album on iTunes or even beatport. If I really want the digital copy I'll look for it on bandcamp.