It's factually wrong to think that Layton of all series' didn't sell when they absolutely crushed it in Europe and Curious Village was a pretty major point for the DS in it's early years. Layton, much like Banjo in the N64 era, stood shoulder to shoulder with first party Nintendo characters and is often confused for a Nintendo character himself.
The series is big, especially among the semi-casual fanbase the DS and Wii cultivated.
I mean, they're both in my most-wanted, especially Phoenix, and I do understand that some people in the fanbase would see them as less hype than, I dunno, Banjo or Doomguy or whatever, but the crossover appeal for them both is huge thanks to their big female fanbase. Plus, hell, anecdotal but just go to any con and tell me AA or Layton has no fans.