How does the PS4 sell so much in Japan?

[GamechaserBE]

CGI-Quality said:

GamechaserBE said:
2.4 million is not really that much...

Depends on what we're talking, here. Relatively speaking, it isn't. However, with the declining interest in consoles, there, 2.4m is a respectable amount of units sold.

The thread title,  PS4 sell so much.   I just don't get how those sales feel like much even in this generation.