I think jRPGs are being discussed so much everywhere because it's a very hardcore-oriented genre. And we all know what kind of people do visit gaming forums.
About sales, how I see it (worldwide):
< 300.000 = bad
300.000 - 450.000 = so-so
450.000 - 650.000 = normal
650.000 - 999.999 = good
1 million+ = extremely good
And I dont think jRPGs cost much to make since they usually dont have good graphics or anything. The only expensive thing is probably CGI movies.







