Well, Gangnam, Seoul is probably as close to Aspen or Beverly Hills as you can get in Korea

Yes, I think the costs are a bit high given that it is just one day in the clinic and a 90 min surgery at most plus 2 consultations/examinations and a Botox injection - I guess the price is for the skill and expertise of the surgeon much more than for the time and effort around it.
Doing it locally may work, if you can make sure you have a good surgeon locally. Who has expertise, experience and you can have contact with former patients who are happy about it and also those who are unhappy (and find out what makes them unhappy and if that would be an issue for you too). But in a way it is as with GRS - there are approx. 10 surgeons doing GRS in Germany. They are all insurance covered mostly. So a lot of people go there and some are happy, some are not, some say they are happy but are in fact not, some get mutilated but dont talk about it etc etc. Others take the effort and money and go to Dr Suporn in Thailand because he does a lot of things differently and has a higher success rate and less complications. But it means going from no costs to 15000 or so. There is constantly fights between those who claim that this is nonsense, too expensive, not worth it, local doctors are as good as him and they'd rather stay local - and those who talk about the different techniques, success rates and so on and are willing to pay any price for a homologous reconstruction instead of a penile inversion surgery which is the standard in Germany. So, its each persons choice. There is also one surgeon in Germany who does not do penile inversion and an increasong number of surgeons are interested now to change that as well, but you have to know which ones are good at the new technique and which ones are not yet good - same thing as with VFS - there are many people doing CTA and also a lot of people doing Glottoplasty, but which of the ones do a good job and which ones have low success rates and tell you , you wont be able to sing afterwards - thats a different story then.