I've been racking my brain on how we could find a healthy middle between the RNG hairstyle coupons and just outright being able to choose, and I think I've come up with something that may be interesting to Nexon for monetization purposes as well as benefiting players (if the technology exists):

Why not take the Damage Skin extraction concept and apply it to Hair and Face styles?

That way the big spenders have a reason to keep buying Royal Coupons even after they get their desired style to sell the popular ones in the future, as well as not feeling as though duplicates are a waste of their money since they can extract them and sell them in the Auction House.

I think the value this would bring would far surpass the loss of people trying to roll Royals on multiple characters, since not many people do that in the first place, especially if the extraction coupons are priced right or only available rarely like the damage extraction coupons.

This could also open up an aftermarket of desirable old or rare styles, which would turn the long periods between style changes into more of a feature than an annoyance.