My suspicion is that none of them have ever experienced real hardship, or ever done real work in the physics sense of the word.
It may be very leftist of me, but I'm glad that my otherwise middle-class upbringing was disturbed by poverty. I lived on free school lunches. The successes I've had as an adult would not have been possible if some pissant Rand follower had been able to deny me meals in my formative years.
There is little doubt as to my professional success. I'm clever, and sometimes I'm even smart. My work is a fascinating mix of technology and anticipation. But I'll never forget being on the wrong side of poverty.