Not worth it. Last time I checked, only a few people can enter that place and I reckon that it is really boring in there (or I might be wrong).
You are wrong at least on it being only a few that can enter. A few is 3... It's closer to 1,000 than it is to 3.
Conversations are special in Area 51 because the that section eliminates all of the scavengers who are too cheap to pay for anything. People who can afford to pay for the Primo membership are more likely to be more mature, based on my opinion. Well.....except myself.
Being a Premium Member previously, I will tell you that Area 51 is not worth the premium membership fee alone. But if you go there and you also need the other features that DP offers to premium members, then it's most definitely worth it... It's worth it just for having your BST threads stickied for 2 hours at the beginning and end of your auctions.