I'm sure they did, Nintendo games are good system-sellers.
Maybe you should take a closer look, Nintendo games aren´t the only games selling well. Here a comparison between 3rd party games last week (Famitsu Top 30). And in case you wonder 7 out of these 8 3DS games are exclusives, while on PSV only a PSP port charted. But obviously there is no difference in support...
07./02. [3DS] Inazuma Eleven Go 2: Chrono Stone - Neppuu / Raimei <RPG> (Level 5) {2012.12.13} (¥5.500) - 96.013 / 266.993 (-44%)
13./00. [3DS] Magician's Quest: Magical Town <ETC> (Konami) {2012.12.20} (¥4.980) - 40.145 / NEW
15./13. [3DS] Tousouchuu: Shijou Saikyou no Hunter-Tachi Kara Nigekire! <ACT> (Bandai Namco Games) {2012.07.05} (¥5.040) - 38.586 / 330.977 (+56%)
16./19. [3DS] Kobito Zukan: Kobito Kansatsu Set <ETC> (Nippon Columbia) {2012.07.26} (¥5.040) - 31.406 / 196.860 (+116%)
20./10. [3DS] Toriko: Gourmet Monsters! <RPG> (Bandai Namco Games) {2012.12.13} (¥5.800) - 28.318 / 62.748 (-18%)
21./18. [3DS] Taiko no Tatsujin: Chibi Dragon to Fushigi na Orb <ACT> (Bandai Namco Games) {2012.07.12} (¥5.040) - 27.718 / 334.482 (+72%)
25./22. [3DS] Aikatsu! Cinderella Lesson <ETC> (Bandai Namco Games) {2012.11.15} (¥5.040) - 23.404 / 65.262 (+72%)
26./14. [3DS] Professor Layton Vs. Ace Attorney <ADV> (Level 5) {2012.11.29} (¥5.980) - 21.109 / 214.728 (-7%)
18./00. [PSV] AKB1/149: Love Election # <ADV> (Bandai Namco Games) {2012.12.20} (¥7.329) - 29.943 / NEW