In your model the causation is that profiteers caused the breakdown of marriage but we shouldn't confuse correlation with causation.
It's also plausible that the decline of marriage caused the preponderance of profiteers.
Indeed given the modern day 'profit above all else mentality' that seems to pervade many businesses thoughts these days, and the length of history of marriage, I'd say the latter is more likely.
As for dual income. I'm sorry I simply don't believe it. In my conservative Catholic circle in a high cost of living area, I'm seeing many families with almost a dozen kids where only dad is working (my wife and I included). Dad is not even a software engineer making high six figures. In many families the father's are totally normal incomes and we have a fair share of people making below average. Two incomes is a choice. There is no difference in average income between the two groups yet one has different values. One difference is the mother's are very productive amongst themselves getting things done economically.
