Yea, my hub that I got used was very quiet. I came from bmx.. so I like them loud.. very loud.
Pulled it apart, cleaned out the grease and it got louder.. Prob pull it apart again and clean each paw too. I'm not worried about it 'wearing' faster.. meh.

Another neat trick is to preload each spring on each paw more, this creates more force on the paws, but also makes that 'click' louder.. as well as removing almost all the grease. You just pull the hub apart, clean off all the grease, pull the paws out, cleaning more grease off, then bend each paws spring in order to 'pre-load' it, then put it all back together.

I also believe that it helps when riding up not only on runners, but also bikers - the added sound that is.