Why is only FF and Dragon Quest JPRG:s selling well?

[Kasz216]

For example... There are

49 RPG game million sellers in the genre. (Taking out the MH games.)

12 "Action" games
5 "Adventure games.
10 Fighters
0 FPS
27 others games.
26 Platformers
9 Puzzle
9 Racing
0 Shooters
3 Sims
16 Sports games
and
4 Strategy games.

RPGs are infact the most popular genre in Japan.