One advantage of buying used lens (if that is a US regular import
lens) is that in case you ever need service, Nikon will perform
service for a fee while they won't even touch a grey market lens
even though you may be ready to pay.
But here's the rub, Pradipta. I talked to KEH, and they can't tell
if the used lenses they're selling are USA or gray market.
I've also heard that while Nikon will not touch a gray market
camera body for love or money, they will repair gray market lenses
and charge the normal out of warranty prices. I don't have
confirmation on that, however.
--
Warm regards, Uncle Frank
FCAS Founder, Hummingbird Hunter, Egret Stalker
Dilettante Appassionato
Galleries at
http://www.pbase.com/unclefrank