Prices might be one of the reasons, but I doubt that's really the main issue.
I sometimes import game swhen they don't get released in Europe, however since the 3DS was released, Nintendo has been treating Europe much better, games that usually never reached our shores, are now being localised: Tales of the Abyss, Spirit Camera, One Piece (although that started with the wii), Inazuma Eleven (started on the DS but seems like they're planning on releasing all the games in Europe, seeing as the anime is being aired here for a long time now), among others.
Nintendo is getting better at localising games in Europe, and if the rumours of Monster Hunter being released in Europe are indeed true, then I won't have any complaints regarding the region lock. The one game that I'd like to play but can't is SMT Devil Survivor Overclocked, but seeing as I have a DS imported copy already, I don't really need it anyway. >.<
And Ghostlight seems to be thinking about localising Overclocked anyway. =3