You wouldn't know Bitcointalk is big place until you become one of it member, bitcointalk is more than a place a place to ask questions and get fast reply, you wouldn't know the value until you become one of the user.
You're right, you won't know bitcointalk is a huge library until you become a member.
However, there is a very clear difference between users whose goal is to join here to learn about bitcoin or cryptocurrencies and those whose initial goal is to make money. The first users don't care about the rankings and also about the merit system, they just focus on certain topics about bitcoin or such rather than topics about meta or other general topics that have nothing to do with bitcoin.
As for users who fall into the second category, they are less likely to (absolutely not) engage in bitcoin discussions or anything like that because they tend to focus on making money. You can tell the difference when you visit the Bitcoin Technical Support and the bounty board. At first I also fell into the first category, but over time my mindset changed and my knowledge of bitcoin was sufficient even though I didn't understand it technically.