|See this? We're not getting this.|
This isn't to say that Dragon Quest wasn't influenced by other series itself, taking heavy influence from the Ultima and Wizardry series.
I wouldn't go as far to say that Dragon Quest has ever sold numbers comparable to Final Fantasy, but when it was pushed, in the case of Dragon Quest IX: Sentinels of the Starry Sky, which had a HEAVY advertising campaign sold very well for a Dragon Quest game, selling 1.02 million units by the end of 2010 in America and Europe.
It could be attributed that Square Enix hasn't pushed for international releases due to it simply not meeting their sales requirements, (Which are astronomical, if their opinion on Tomb Raider is anything to go by) or not being able to push mass amounts of DLC into the game like their other games. (The creator of the series, Yuji Hori seems to generally interject if any interferences come between him and his games)
Health returns to talk about his Japanese copy of Super Smash Bros. For 3DS.