Price of Spotify Premium cost about $9.99 per month. For that price you get an ad free experience. You can listen to music as much as you want and never get interrupted by an ad. You can also listen to album, arties or playlist with unlimited skips at anytime.
The way that you have Spotify off line is to hit the gear icon in the settings, go to playback and in that section you should see the equalizer and offline. Hit that button next to the offline and Spotify should be now offline. The way that the company makes money is through the free tier supported advertising and the premium subscription. Advertisers pay for the exposure and Spotify pays out royalties. The company has helped the music industry by saving companies and artist money.
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