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Are you keeping it in a plastic bag? That traps the moisture that lets it mold. A proper bread box is designed to let bread dry out slowly so it doesn't mold.

A lot of what's added to industrial bread is indeed to avoid staling. Doesn't have much to do with moisture.

http://www.daveskillerbread.com/100-whole-wheat

> INGREDIENTS: Organic whole wheat (organic whole wheat flour, organic cracked wheat), water, organic dried cane syrup (sugar), organic expeller pressed canola oil, organic wheat gluten, organic molasses, organic cultured whole wheat, sea salt, yeast, organic vinegar.

Is it the vinegar?

The extra gluten and the relatively large amount of sugar. That bread is also unusual for not including various enzymes and glycerides.

additives mostly explain it, I expect.