http://www.quantcast.com/4-ch.net

We allegedly get 7.2k unique hist per month, though I'd take anything Quantcast says with a grain of salt.

More importantly, 4-ch has a history of being a bridge between 2ch and the various English weeaboo communities. There are a lot of Japanese people in the world; why is it so unbelievable that a few of them might find their way over here?