Up until 2011, that entire series was run by the developer Gust before they got bought out making Toei Kemco maybe responisble for what 5 games in that series, 2 of which were remakes. And really that series isn't exactly major outside of its niche.
Also WOW, the Atelier games really? That is a huge insult, with you putting the Shin Megami Tensei franchise in the same category as Atelier games. Shin Megami Tensei (or MegaTen for short in Japan) has spawned 9 different animated projects (movies, tv series, OVAs, etc.), multiple manga adaptations of different games and over 35 games (not including rereleases, Pokemon style double releases, etc.). Up until probably 5 or 7 years ago, it was considered the 3rd most popular RPG franchise (excluding Pokemon) behind Final Fantasy and Dragon Quest. To compare running that franchise to Gust's modest success is like comparing Dead Space to Resident Evil (if Dead Space was much less successful).