I am kinda tired of constantly reading through mental gymnastics, analysis and equations to calculate idols' income.
Like people keep throwing this Spotify/Melon multipler around, but it is all unverified. Spotify officially never confirmed such rate. The equations to count album sales income? Also false, came from old TVXQ lawsuit info.
To give you a perspective how much money idols make, Dasom, 1/4 of Sistar, group that never had physical sales and only relied on digitals, + one solo acting role bought a building worth 1.5 million USD back in 2014. If that doesn't already sound like a lot by itself, take inflation into account and add 30% to it. In an age when international popularity wasn't that huge that is, like that's literally just Melon and CF money.
Or a recent example, Fifty Fifty's debt got paid off, without any CFs or album sales. Cupid alone paid it off and it hasn't even hit 1 billion on Spotify. Talk about how "streaming doesn't bring money, Spotify pays pennies".