[zirkonit]

It's a cultural thing. Chinese (and many more Asian nations) work so well in 10,000, and sometimes, it feels more natural to me as well.

[aikinai]

The problem with languages that use 10,000 is they still use commas at 1,000, so you get a very awkward offset that then requires a mental translation between numeric and verbal representations.

Sure if you grow up with it, you have that translation basically hard-coded but it’s still not ideal.

[lifthrasiir]

Which is stupid. It is annoyingly frequent that the common scale in the table is stated as powers of 1,000, not 10,000, but the scale itself is written verbally (e.g. "단위: 십억원" billion wons, much like "ten thousand dollars").