That means if there are 3000 people show interest , I just have one stake, I just get only 1666NEX?
Yes. That is correct. If all you did was registering your email at
www.nexcoin.net and only 3,000 people did so, then 1,666 NEX is what you will receive.
Now if you
(1) Liked on FaceBook
(2) Followed on Twitter
(3) Referred 5 other unique users
Then you will get 1,666 x 8 = 13,328 NEX.
This is the only 2nd generation coin that is being released where you can still get a stake by not having to buy in.