The reality is there is gonna be a price difference between people who live there versus people visiting. People on pursforum and kakao chats go through this rabbit hole debate all the time. It's usually a waste of time and energy to chase Korean app promo prices.
In the end, it's still usually cheaper than US options (20 to 40%) and you get more access to treatments not as abundant elsewhere. If it starts to get on par with US prices, then that doctor better have the credentials to back it up. that's my rule of thumb.