Display MoreDigital charts prove to business the popularity of the girls and that wins them more CF opportunities, which is the most profitable way for GGs to make money.
I don't think on an average male idols get as much endorsement options.
So digitals do matter, though not directly.
Physicals is direct fan spending. BGs tend to dominate there.
Of course, these are averages, there are always exceptions to the average trend.
Yeah CFs are a better way to get money than digitals, I know they kinda depend on it but I feel like CFs are more benefitial to certain members that get popular because of their looks, personality, or a viral moment than to the whole group most of the time.
Of course, not all groups are the same, there are ggs like Oh My Girl (until recently) or Brave Girls whose success heavily depends on digitals and getting CFs a lot more than for ggs on the Big 4.
I also have to say that you can get good CFs without charting that good though, like Mijoo (ex Lovelyz) or Loona's Chuu, but you need luck, looks, variety talent, etc.
Girlgroups are starting to sell physicals a lot too anyways though, which is good. It indicates more touring power which is something most ggs were not that good at before.