Intelligence yes but not necessarily the correct education.The enduring puzzle for me is that you have to have a lot of spare income to buy overpriced cables, so you need a decent job to generate that income. Better paid jobs (doctor, dentist, etc.) tend to require at least some intelligence...
Plenty of people show no interest in a subject at school and chose not to study it at a higher level yet as adults believe they have sussed it as well as people who have studied it for decades. A bit of research on the internet is all they need even though they don't know enough to tell truth from fake.