Cool video!
Cans need to be sold over the counter. they are hearing protection in my opinion. less noise complaints from people living near ranges.
airliners got quieter engines largely in part due to noise and noise complaints. fuel efficiency also played into it. silencers can do the same thing. There is no reason in my mind that someone needs to pay a $200 stamp to own one, and no need for them to cost as much as they do.