Re: the side gripe--
A) It's an entirely different thing, of course, if the expert offers to help, for whatever reason/s.
B) it's probably also a different thing, for some kinds of help, if some acquaintance-type person asks for something like "where to look" for whatever. This could involve everything from "where's the good online help" to "how do I tell a good hired photographer from a bad one, before paying them" to "where did you source that material" and probably others I'm ignoring. The point I'm getting at is that some people might want help while not being complete dorks about it.
C) Obviously you, the expert, get to decide for yourself how much you're willing to extend yourself to help any given person.
D) I'm glad I don't have any of the various sorts of expertise that people want to take advantage of for free.