As a personal rule, if I know how to solve something that somebody asked, I just try to help him, telling how I solved that problem.
But if I have to do research just to help someone, then I just ignore the post.
I don't have any problem sharing knowledge of something that I know.

If people who knows how to do it explained to you how to do it right away (saving you hours of having to figure it out by yourself) the value of their lives would drop considerably because knowing that is mostly all they are worth.

Heh, sorry for the random link. To be honest it's been too long since I've done any raw lua stuff in c to have really commented more usefully. I just tend to use luabind for everything nowadays.