Nuclear Muffin said:
Dawn of the New World was a crappy low budget spinoff that recycled most of the same areas and didn't even have a world map. The fact that it sold as much as Vesperia is pretty telling of where the western Tales fanbase is...
Vesperia was 59.99 and only on Xbox 360, a system I would argue, at the time, probably wasn't resonating in North America with the average jRPG fan for various reasons, the biggest being its high cost.
DotNW was 39.99 (I believe) and on the Wii, the hottest selling system at the time (and cheaper than 360). This was one of the few RPGs period available, too. Also a sequel to the best selling and arguably most popular Tales entry in the series, so demand would be high.
I mean, we could go more in depth about the trends of the jRPG demographic to argue more thoroughly why DotNW probably sold as much as Vesperia, but I honesty am not the least bit surprised at the North American #s.
Edit: If Namco were smart, Tales of Graces F would be heading to 3DS...