I have an aftermarket can on the thou, but the main reasons for that are A) Lack of urgency on the standard sewing machine can and B) I had a spare, and it looks better 
I still wear earplugs, as wind noise is the main problem causing deafness, not exhaust for the vast majority. If you are brave enough to subject yourself to hours of over 80 decibels, you will cause deafness. The quietest helmet on the market is the German brand starting with Schuberth, with a helmet that has internal noise of 85 decibels at 100 kmph. That gives 8 Hours of riding time (with no other noise than wind) before damage sets in.
I was callous once, but I notice more and more, as I grow older (at 24 I ain't ancient) that my hearing isn't quite as sharp. I want to keep it for as long as possible. So, in reference to that, the volume one would have to listen to music to, in order to be louder than the wind noise in the quietest helm money can buy, would still be plenty sufficient to cause hearing damage within minutes.
Also, hearing traffic coming can save your arse. Saved mine when Sam Smith round around me in the last lap at Ruapuna in the weekend.
Boyd hh er Suzuki are my heroes!
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