The question is who cares? The EU versions of ROM's are usually the exact same as the NA version...
That or the dumpers in the NA have had stricter laws come in for file sharing..
Yeah, well usually the games come out in US a few days earlier. So naturally they should be out on the interwebs before EU games...and i doubt its stricter laws...you buy a game, dump it, throw it on torrents or upload it to mediafile or whatever.... then its hard to get caught...like leaking an album or something.
The reason is probably just the people who usually dump (its probably like...2-3 people they everyone relies on...like Venom or something) are just busy, or haven't gotten their shipment of new games in or something (they're usually people who work in retail who can grab the game, dump it, then bring it back.) or they're just too busy or something. It should pick up again. It'll start to die more when 3DS comes out though i rekon.