-- Last Updated: Oct-26-12 2:14 PM EST --
that cost about $100. That's the one I have: Pro-tec.
You're the one who came up with the $30 number. So I assume you know one. Go ahead and elaborate on its drawback? Not that I (or I suspect the OP) care, because neither of us came up with that number.
[EDIT] I was mistaken. You were not the one who came up with the $30 number. Jim below did. You just used it. My apology.
I totally agree with your point that cost doesn't equals protection. I just don't draw any hard figure on how much exact dollar amount is worthless. It will always depends on the specific helmet in question.