I won't answer for GeneralAntilles but since you invoked Maemo Greeters...

The original premise for MG was absurdly simple: people voluntarily add helpful links to their signatures and from that point on need do nothing other than post.

And to be honest that's an okay stopping point. It distributes useful information farther and wider than just about any other method and with almost no effort.

Now, some Greeters asked if they were expected to answer "help desk" type questions. My first response was and is no-- mainly because the barrier to becoming a Greeter was so low that people unprepared to actually provide true user support might feel obligated to answer questions that they were uncomfortable answering. In fact that did come up in PMs.

As far as I'm concerned anything above and beyond simple direction to resources was outside the scope of the original idea and maybe should stay that way. On the other hand, it's only natural that some experts would (and did) sign up, and some newcomers ramped thjeir knowledge up to answer questions... but I hesitate to formalize that further.