There's a whole range of soliciting information that goes from "Beat the information out of them" to "Ask a person individually" to "Ask people as group" to "Allow information to be given" to "Discourage people from telling you things" to "Yell at people who talk to you without you asking them first".

Depending on your approach, you'll get differing amounts of information from different people. A more charitable reading of the post you replied to might be: You shouldn't be content getting information only from those who like to talk and volunteer information.