Yes, I've noticed it too. From my experience it all sounds quite normal. It's probably enhanced by the fairing on the Tracer (vs the naked versions).
Compared to my NC750S its quiet. This sounded like a can of marbles being slowly rotated - again though, quite normal.
A good idea is to compare it with another owner or forum member. At work, a colleague has one with 20,000 miles (32,000 km) on it which is an ideal opportunity for me to bother him for info.
That said, if you're concerned, get it checked out. Yamaha's response does sound quite honest though and NOT like their avoiding something.