If the site is legit(i do not know if it is), there is nothing wrong in doing that, almost every website tries various means to add more subscribers to their network, it's normal.

I'm yet to fill in those requirements, but I will the moment I can confirm the legitimacy of this site, since we're required to give out our email addresses, I wouldn't want to start receiving unsolicited messages.
The prediction would be fun, though I think it's almost impossible for anyone to get the exact price, it's almost Christmas, would it take a bull, a bear turn or would it remain around the same price. I'll be guessing a drop.