you're so funny guys, do you really think that italki could teaches you a language from A to Z ?
Learning a language accuratly requires hard work, and a lot serious efforts. It's not , how the majority of italki users think, a matter of frivolous chatting conversations !
A lot of the users do not have access to native speaker. Do you? Do you have native speakers that you can practice with or do you believe that because you can read and write a language that makes you fluent?
What is knowing a language if the people do not understand you? Non-textbook dialogue is actually helpful to most people. I am guessing you are not included in that. Also, not everyone has the same education levels, thus the content of converstations will be different.