I'm sure there are "status costs" involved, but in general you will find that the expensive models are lighter and are supposed to provide more ventilation. You won't normally find these "discounted" down to $30-40. The lesser expensive helmets will suit you fine, though. As stated above, the level of protection is no less. The cheapest models comes in one size to fit all. The next level, around $50-70 come in usually 3 sizes, S, M, L. In addition they made add the ability for the internal plastic "head strap" that wraps around your head (not the chin strap) to adjust to fit your head more snugly. Find one that feels comfortable and fits well. When I purchased my current one, I went to one that's about $65 because I could "dial in" the tightness around the head and also the back end sticks out a little further, which hopefully will provide a bit more safety room.