$2400/mo is good money no matter where you live - true, you can't afford a 3000 sqft house, but $2400/mo is nothing to sneeze at.
It's really not a lot in the D.C. area, or probably big pieces of the East Coast, Chicago, L.A. or other places. It sounds like a lot...but it's just not. We moved in 1993 making a little more than that...and it was tough even with a budget.
The guy probably had no business buying anything at that salary.
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$30k/year is 'good money'? Where do you live? You can't even move out of your parents' basement on that on LI. The city's worse.
When I was active duty I was making over twice that but the idea of buying a $410,000 house like the lady in the story never crossed my mind. These people are just plain blind to reality.