so, they promised $10 for early signup??
or??

Yes, that's what their front page says.

heemmm, okay.
let's see if they'll give us free $10, I have already signup..., Grin

Also curious. Anyone got ten bucks already?

or may be they are collecting emails of bitcoin users for marketing purpose or to sell the data others

For this only purpose - looks sort of too complicated, doesn't it?