If you buy by the ton from a co-op or directly from the farm, you will always get grain cheaper than buying by the 50 pound bag at a feed store.
What is astounding to me is the fact that people are burning grains when we have a world-wide grain shortage. I am sure that the economics of burning grain will flip in the next year or two.
Then again, since you are burning corn and it is most likely a hybrid from Monsanto, burn all you want.
The economiical advantage comes from burning corn you raise.
+1 is no income tax on your grain you burn. 20-30%
+2 is no sales taxe on your heating fuel 7% apx.
+ 3 soon to come will be the sidestepping cap and trade fees/price increases.
You keep more for yourself.
As far as burning corn from a farmer. If the farmer will sell it to them at market price it would be $3.00-$5.00 a bushel.
Hope this helps.
Hope this helps you understand the madness.