I seem to see 370Zs all the time
To be honest I think only 1 of those people daily drive their Z. For the rest its their weekend car. I'm sure many other owners use the Z as a weekend car also due to it's lack of space and that's probably why MOST of us don't see many on the road.
As for Nismo's yea those are extremely rare. I have yet to see a legit 350Z Nismo (my old neighbor had a 350Z that he put the Nismo body kit on, Brembos, and all that good stuff but it didn't start out as a nismo) and only 4 Nismo 370Zs.
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2011 IOM LS - Drag DR 19s 18x7.5, Projector/Halo Fogs, Blacked out Gills, Red Calipers, Factory Spoiler, 15% Tint
2011 CGM LS- Injen CAI, Vmax Ported TB, Vmax Black Ice O'Lator, Carbon Fiber Bowties, Carbon Fiber Gills, Factory Spoiler, Stock SS Exhaust w/ Magnaflow x-pipe welded in & stock muffler delete, Miro 112 18x8.5 +35