I hope that I'm wrong and majority of them have pulled their weight and helped out rather than play for early release and a free copy. If not and they just wanted it for to play, Beth really shouldn't give those few a free copy of the game.
The people who've won when you go on their profile and check their last online status; from a few who I viewed 4-6 days after the beta codes were released haven't been on since then. Yet I haven't checked recently so maybe they've been on since then.
As well from rumours from other members.
You are going to the profile of people who have won? How do you know who has won? You might be getting a few that have put that in their sig, other than that...
It's conducted in a restricted forum. Even going to a known profile will yield nothing about posting in that forum. So, that leaves you with just rumors. I wouldn't put much faith in what a few rumored members may or may not be telling.
Still, you have nothing solid to base your claims on. It's all speculation.