Excuse a Victorian for speaking, and with my limited experience with haystack/shed fires (only three):
1. Are they not very difficult to extinguish (once they've got really going)? As they tend to smoulder within and reignite (spontaneous combustion - all that wet hay). Need to be pulled apart, bale by bale and separated, all with FS attendance for when it goes up again!
2. I have been told at CFA training session that animals will not eat smoke-logged hay(can any farmers confirm this?). Hence hay is wasted anyway.
3. How does farmer now get rid of the stuffed hay? Burns it! So suggestion certainly to we CFA types was to let it burn to save the cleanup/ salvage time!
But I must admit multiple days (as in the above example) seems to be just as bad!