Oh yes that's true but in reality if people are on a budget it's not really that worth it. Like IIRC a lot artists these days have merchandise and those have better support options to the artist.

In the Kpop/Jpop(/Cpop/etc.) world, some of us also just buy CDs, exclusive socialization access, sponsored brands, etc. for our favorite idols. There's also the option to meet them through the staff members, fan meeting, et cetera.

Or like these days some of them are in New York, Milan, Paris, etc. doing Prada, Gucci, Chanel, etc. promotions as the local/global ambassadors for the brands. And so some fans just show support on the actual IRL sidelines by hyping the idol up when they're on the way to the event/show. Sometimes in those western fashion events, the idols take so much time interacting with the fans or signing stuff that they get told to hurry up by the event people, lol.

I forgot exactly what the ratio was, but IIRC, touring or concert sales are one of the biggest ways to support artists aside from merchandise. Otherwise streaming or spreading the word is also good enough.