There's about 1/2 dozen export buyers/dealers in my area, they all spoke with one voice about the big bales.  "we won't buy big bales, our buyers don't want them."

Now granted it may be different in different markets,, but 'here' we have to deal with what we have, not what we'd like it to be.

There's enough guys growing well over 1000 acres with 5-7 3 string balers than if big bales were an option they would likely switch to the big bales. Nobody has. 

 The other problem is when a 3 string bale is rejected for export it can still be sold to about anybody.  Big bale gets rejected,, I seriously doubt any one will buy it. Very few are set up to handle big bales. "Here" hay is graded by the guys loading the trucks at the farm. There is a perfect bale and rejects, and dirt-sunbleach-single weed on the bale will get it rejected. I've seen a rebaled broken bale get rejected.