The dissonance comes from the fact that a lot of hackernews readers make apparently high incomes, but the cost of living in their areas keeps them squarely working class.
The best example I can give is in the Bay Area. I lucked out with $2850/month to rent a 1400 square foot house in San Leandro. Except that I worked in South San Francisco, and my commute was 45 minutes to 90 minutes each way, every day. I looked into it, even did the math with average commute times and Health and Human Services housing cost data, and found that if I wanted to cut 15 minutes off of that commute would cost me an extra $1000 a month, or I'd lose the yard and the other bedroom. With a kid, a stay-at-home spouse (a lot cheaper than child care given wages for my wife's field in the bay area) and a dog, that was just a non-starter. I knew people who drove in from Vacaville or Tracey, every day, just to keep the housing prices within their means.
Prior to that experience, I honestly thought $140K a year was the best I could ever hope for. I was top 15% of individual wage earners in the country but I was considerably more stressed out than when I was making minimum wage at an office supply store in suburban Oregon.