Now, that IPO type model (which will also be Etherium I believe) isn't necessarily a scam just because it breaks accepted "rules".
Selling shares of a new tech to the market at whatever price the market will bear, is not scamming. I don't have any evidence that NXT is scamming anyone. I have also sold shares of my companies to the public.
What I don't believe is that these things will become currency. At least my shares have never succeeded on that
I'm not sure the IPO model is even legal (in the US) unless the developers register with the SEC. How is selling shares in Nxt different than selling shares in Satoshi Dice? We know Mr. Voorhees recently got nailed for this: https://bitcointalk.org/index.php?topic=637435.0