Why were statue spawn limits reduced again?

[Myth]

The title may not be exactly what I'm asking but I was just wondering why were the limits to how fast a statue, or mob spawner, could spawn mobs in reduced in, 1.3? (might be wrong about it being 1.3)
I remember them being reduced so other methods of farms were introduced, but what was the reason behind reducing the limits?

 

[Hie the Badger]

Because people were getting too much of the useless currency too fast. So they nerfed farming techniques to try and make the money worth more (hint: it's still useless).

And don't tell me they are still actually catering to the trade section.