I agree that this is the extreme example, but one of the posters said in the same breath that she was 250k in debt, but wanted to stay home with her kids, living off her husband's salary as a high school teacher. That would be living off 50k while 250k in debt.
Let's look at a realistic situation. I earn 85k in a state with no income tax. I'm also not having health insurance taken out since my husband has it through work. I'm taking home roughly 4500 a month after taxes. A thousand bucks goes to loans (remember my debt load is only 76k). My mortgage plus taxes is $1200 (cheap house 146K). Now I'm down to 2200. Day care runs me 800 per month. Now I'm down to 1400. I have a car payment, car insurance and drive 500 miles a week (can't afford to live in the area where the highest paying job I could find is). Now I'm down to 750 bucks a month to pay utilities (AC in Florida in the summer), groceries, clothes/diapers for the baby, tires, home repairs and all the incidentals. Oh wait a minute....I haven't saved anything for retirement or my son's education.
This is doable on dual income, but not all veterinarians are dual income. This is also not doable with a more expensive home. Median home cost is over 250K, I paid 146K. Also...and this is the most important point - I don't owe 250K. I owe 76. If I owed 250K, my loan payment and mortgage would eat virtually every penny I earn...especially if I lived in CA...even if I earned 6 figures.