in the end the labor is not worth the cost but the beauty of understanding, building and maintaining soil is priceless.
you have to wonder what causes your plants to fail, could it be the soil properties? pests? fertilizer? those all remain in the rebuilt soil.
seeing as organic fert sticks in a bag of promix will produce fire I see no reason other than experimenting/recycling to reuse soil on our crop. I recycle 100% of mine in my outdoor gardens