[lotsofpulp]

At the same time people start earning those incomes, they are also paying $20k to $30k per year per kid for daycare. Couple that with $50k+ retirement savings (max 401k and HSA) and 2 $50k cars, and it can seem tight.

Also, the higher the pay, the rarer the source of income, and so lower probability of replacing your income if you lose your job. That means you might want to put down more than 20% to ensure your monthly mortgage payment is still possible even if your income drops by 30% to 50%. Such as if the wife has pregnancy complications and cannot work, etc.