Display Morefandom size =/= no. fans who stream
Not every fan is a streamer. Some put more effort into that while some don't, plus streaming only gets you so far. Without the support of the GP and new unique listeners (since charts would sooner or later filter streams) - if your song doesn't click, then it wouldn't really chart that long either. Plus physicals can be easily inflated by the buying of multiple copies/versions. Streaming/Digitals too can be inflated by fandoms, but it's more heavily regulated than physicals.
Anyways, what's the point of selling physicals? Money. That's it - these idols aren't putting all this effort for nothing, they need to make an earning, and physicals are one way of doing so.Maybe it's not much, but it's certainly more than what digitals can give them.
(That said, a good mix of both digitals and physicals would be most ideal)
Was going to say this. Y’all seem to forget that Korea has way too many streaming services for a country with a relatively small population. And the most popular charts that are easier for fans to top are Genie and Bugs. That’s why a lot of BGs and rookies last year fared better on these charts than on Melon where more than half of them were non-existent.