It could also be that the fact that there are requirements to this at all in NTNB (not just looking for Japanese names that are phonetically similar to English names or words in the case for me) can make some newcomers stay away from this and move to CAFs.
That's how I see it.
~I luv London Tipton 'cause she's an idiot like moi~
My pinool:
http://www.behindthename.com/pnl/149249