I'll pay max price for wheat up to 6,000.
I'm looking for a supply of 36/wu (864 per day)
All you need are 7 squares of wheat farm at level 4 to provide this quantity.
To finish the math, that's 7 squares, 864 units of wheat, 6,000 each yields 5.2M/day just from 7 squares. That ends up being 30.8K/wu*square. That's a great return, just try to get that from some other ql 0 product.
BTW, if you have high ql wheat, I'll pay more.