Don't mean to sound like the Big Scrooge, but I wouldn't be for that.
Oddly enough, it's not as "bad" as it sounds:
I would prefer they arrange another publicity run out there on the web to attract new players.
That said, if it was along the same lines at the first, those current FS players who didn't get one of the last ones could have access to it as well.
Just my two cents.
+1 for another publicity offer.
But to keep players in the game, it is good to have the booster pack, well as a boost to get started. It does help.
Ofcourse, I'd be favour of anybody who did not get it yet, should get one aswel, for the sake of fairness.
My point was mainly from the view that those that sign up, should be encouraged to keep on playing, the booster code helps.