As I repeatedly like to remind folks, logic has no place in Internet discussions.
People make all sorts of claims based on their beliefs. I’m of the “give me DATA or give me death” school of thought.
I am unaware of any recent research that has shown expensive (certified) helmets are any safer than less expensive (certified) helmets, or whether the different helmet certifications (DOT, SNELL, European, etc.) show any difference in injury or fatalities.
The only research I recall was the Hurt Study published decades ago, If I recall correctly, that research showed only that wearing a DOT or Snell certified helmet offered more protection than wearing no helmet (or a non certified one??), and there was no difference between DOT and Snell. My recollection may be wrong. I welcome seeing published research on the effectiveness of motorcycle helmet protection on the issue of less expensive vs more expensive, and real world differences between DOT, Snell and other certification standards.
Personally, I own relatively inexpensive (HJC) and expensive (Schuberth) helmets and like them and feel equally safe wearing either. But that’s me.
Tim