Back in 2014, I was in the mountains and while turning a blind corner I hit sand that a road crew had laid down over tar. It was like hitting ice! My bike did a 360, and I was thrown 800Ft down a embankment. My Shoei (Expensive) helmet saved my life!

After because I couldn't afford the repair fee's + a new Shoei in order to get home. I bought one of these http://www.bikebandit.com/riding-gea...orcycle-helmet

It doesn't look like it but there are open-able vents in the mouth and on the top, that work great when your moving as they ram air through your helmet.

When you think that a helmet is a "one use" item, even bike helmets, and you have to discard them right after. I don't see the point of spending the extra cash if they have the same safety rating.
The old bike helmets at least remind me of a motorcycle helmet, where as the new ones feel cheap and flimsy.