Why was the King James Bible divinely brought about for English speaking readers?

Because King James was a descendant of King David.

So no human hands or printing was involved? Just a divine cloud bringing the books down from heaven.

With so low production costs, the distributors must have made a killing

It was not divinely brought.
King James had the translation made for political/religious reasons.
It was born out of the Textus Receptus which was so hastily put together, even it’s maker Erasmus said it was done quickly for money.

However, God allows it just fine because even though it’s such a bad translation of the original scriptures, the truth that leads to everlasting life can be found in it.