A little less than what I could turn around and sell the reward for in the market.
...and therefore the amount you burnt was very close to the value of the coins?
Chicken and the egg:
The price is what the market will pay.
Then, if you can produce them for less than that, you do.
If, on average, it costs you more to produce them than the market will pay, you shut down your equipment and go out of business.
If, on average, it costs you much less to produce than the market will pay, you sell them for full market price and pocket the profit.
In either case, the price is determined by market demand, not your costs.