Hi,
Over the decades I've done a lot of riding with and without helmets. I've also had helmets from about every generation: from the heavy and hot Bell helmets to the very light Giro helmets that were Styrofoam only. While features vary tremendously with price point, from my perspective, you get "more" with higher priced helmets and not just more "name" value. The question is, what kind and how many features do you personally need?
I think the biggest difference between cheaper and expensive helmets are comfort (fit and weight) and cooling. What I say to people is that if you either ride less or don't wear a helmet because you don't like it, then get a better one that you do like. Price? Same as from my motorcycle days -- how much is your head worth to you?