寫了暢銷曲能賺多少？

https://www.digitalmusicnews.com/2017/10/03/hit-song-justin-bieber-royalties/

Andre Lindal參與Justin Bieber的As long as you love me，佔20%的版權，賺多少？

“So, on the first page. It says the total royalty amount was $149,000.”
“Top ten hit. 20%, $149,000. This is three years, three years in.  This is his performance royalty from BMI.
“The song played on the radio, it had 347,820 spins.  The royalty amount on that alone, was $53,000.
“Let’s fast-forward to this page, the interesting page.
“Sirius XM, not bad.  1,509 spins, earned him $765 dollars.
“You ready for this?
“Pandora: 38,225,700 spins earned him $278.
“I’m not finished.
“YouTube: 34,220,900 spins earned him $218.17.

經由線上網站獲得的完全不成比例，那些網站剝削了音樂人嗎？
那，音樂人幹嘛還擺作品上去？
好吧，就算網站剝削了，數字有可能漲十倍嗎？十倍還是個很零頭數字，根本不值一提，總不致於能漲成百倍吧？真的需要擺音樂上去？