I've done this experiment a few times last season, I've melted down the ice and had sugar content as high as .75%, usually in the area of .5%. IMO that's a loss if I pitch it. But I was also hurting for sap last season.
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2015 - 18 taps 1 Gallons, Turkey pan
2016 - 85 taps 5 Gallons, 2x4 Smokey lake maple continuous flow flat pan
2017 - 130 Taps, 18 gallons, 2x4 Smokey Lake Maple continuous flow, 8'x12' sugarhouse.
2018 - (planning) 250 taps, 4x40 200GPH RO, 2x4 Smokey Lake Maple continuous flow.