I was playing around with making granite bricks. I decided to try the slider that lowers the amount needed for making each brick. Mind you, it still says 2 are needed. I am also a Grand Master Crafter. Level 100 miner. here are the results:
[03/22/17 22:50:40] You have created 675 Granite Brick.
[03/22/17 22:50:48] You have created 675 Granite Brick.

(below are bricks created with lower resource cost)

[03/22/17 22:51:00] 3 of 675 batches succeeded.
[03/22/17 22:51:00] You have created 3 Granite Brick.

(Normal)

[03/22/17 22:51:27] You have created 675 Granite Brick.
[03/22/17 22:51:44] You have created 675 Granite Brick.

(again with lower resource cost)

[03/22/17 22:51:58] 9 of 675 batches succeeded.
[03/22/17 22:51:58] You have created 9 Granite Brick.
[03/22/17 22:52:31] 5 of 297 batches succeeded.
[03/22/17 22:52:31] You have created 5 Granite Brick.

Now what good is this function to anyone, if a lvl 100 miner making T3 resources, can't get any bonus?? And the amazingly high amount of resources that failed... Holy..... cow. I seriously think this feature needs looking into, or needs to be removed. as it does not help anyone, with anything.

My advise to anyone reading this? don't EVER bother to use this disfunctional function. you only lose!!