Hmmm...

The numbers extremely small - insignificant I agree - but logically I am correct.

Case: You give away a coupon. He who gets it is able to buy more miners. This increases the hash rate which increases the difficulty. Your own miners make BTC 0.0001 less hence you lose BTC 0.0001.

Case: You sell a coupon for BTC 0.01. He who gets it is able to buy more miners. This increases the hash rate which increases the difficulty. Your own miners make BTC 0.0001 less hence you profit BTC 0.0099.