they banned chairshots to the head not to prevent concussions, but to prevent the media from using the footage and saying "DAMN WWE AND THEIR CHILD POISONING WAYS". The media hates wrestling. A simple back bump does minute brain damage according to a harvard? study. Pro wrestlers suffer similar brain damage as NFL linemen.
Here's a true story. I attended the harley race wrestling academy, I wanted to be a wrestler. First day I'm taking good bumps, they want me to take one more, I fling myself down and when I land, I'm dizzing. I start puking, I go home, still dizzy, still puking, nauseating headache for a week. I didn't want them to think I'm a pussy so I went back the next week, did a 10 bump drill, rolled out of the ring and fell unconcious. Woke up 12 hours later, catheter in my penis, tube down my throat, and 2 tubes in my arms. They weren't sure I'd be able to function again. I suffered a subdural hematoma. something that has a 75% mortality rate. I'm lucky to be alive and lucky to be pretty much normal minus awful headaches once every few months.
Point is, wrestling in general is dangerous and hurts. It turns out I've had 2 fused vertebre in my neck since birth, because of that I can't tuck as far as I need to when I bump, causing my brain to rattle around more. Head injuries occur from bumping too much. It doesn't look like it hurts much because the ring bounces, but it does. Watch cena bump, he doesn' bump as flat and crisp as he did before his neck injury because it probably hurts and scares him shitless.
the fine is nothing more than something to show "hey, we're continuing this thing". It's away to keep public image good. Wrestling is rough with or without charishots, the media will never admit that, but it is. Vince just took away head chairshots so they wouldn't have a graphic clip to run when bashing his wonderful product.
One more thing, Benoit took unprotected chairshots to the back of his head. Which is about as dumb as it gets. The back of your head is much more sensitive and believe it or not, the chairs are hard.