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Because you were guaranteed that what you were downloading was what it said it was, and was high quality, and would have the correct tagging and album art and all of that.
It's been shown repeatedly that a large part of piracy isn't about cost, it's about convenience. It was easier to pay $0.99 and get what you wanted when you wanted it, than download 8 files off of Napster and hope that one of them was actually a decent bitrate and was the song the title said it was.
Back when eMule was a thing, it was super common to spend an entire day downloading a 700MB video file at 5kb/s, only for it to be Fight Club instead of whatever you thought you were downloading. It's the same thing with music.
"We think there is a fundamental misconception about piracy. Piracy is almost always a service problem and not a pricing problem. If a pirate offers a product anywhere in the world, 24 x 7, purchasable from the convenience of your personal computer, and the legal provider says the product is region-locked, will come to your country 3 months after the US release, and can only be purchased at a brick and mortar store, then the pirate's service is more valuable."
-Gabe Newell
Sauce: http://web.archive.org/web/20120307035423/http://www.escapistmagazine.com/news/view/114391-Valves-Gabe-Newell-Says-Piracy-Is-a-Service-Problem
Music piracy was big till spotify apprared. iTunes had a limited selection, music remixes, small band stuff were not available. iTunes only had what Sony and some other music distributors supplied. I understand what you are saying but still, piracy was there and iTunes was not primary source. Spotify came and now music piracy is basically limited to high quality audio albums which is a niche market.
Or, with Napster, the person you're downloading from signs off when you're 40% done with the download.