Other than it's less expensive to impliment... not really. Only 2 nametables exist on the NES... for games to have 4... they'd have to have the extra 2 built into the cartridge. That means the cart will be more expensive to produce.

Besides... the only advantage to using 4 nametables in this case is that you wouldn't have that graphical oddity on the right side of the screen that someone mentioned earlier. A lot of people don't even notice that glitch... so putting all the extra money for the 2 extra nametables would have been silly of Nintendo to do.