Am a writer who loves to write, learn from and communicate with other people...let's just put all that talk aside. As much as I want to say all those things, not that there aren't part of it, am mainly on Answeree because it's one of the most reliable writing sites and it pays to contribute.
Just like I stated above, the main attraction to Answeree for most of us is earning, I bet the bulk of us ended up here in our quest for ways to earn online. Do not get me wrong as Answeree has proven to be much more than just a site to write and earn, it's a community filled with enlightened people willing to share knowledge seamlessly. You'd understand my point of view when you put in a few days.
Going back to the question, I like to believe majority of us got invited here because Answeeree isn't quiet the everyday site you could easily pick up on search results. I, for one, got invited by my sister because she knew I work other sites like Answeree. Am a writer and I do it for the knowledge, as a hubby and most definitely a source for income. I hope my last sentence gave you a proper answer to your question.