Most shares in my area are 3 to 1, some 4 to 1. The cost of equipment and labor is much more than it once was, plus less people custom bale around here. When I was growing up it was 50/50.
I have one 30 acre field I bale 50/50. He has excellent hay, fertilizes and limes out of his pocket. The first cutting this Spring yielded 147 nice tight 4x5 rolls.
I am $25 per roll on good hay. I will not spend my time on thin hay.