I recently had to figure out how to do something with wget: get everything below a directory on the web-server, without following links to outside it. So I logged in to FreeNode's #debian channel, where there are many knowledgable people to ask it. The first answer I got was "RTFM". ...No matter how much you bleat, the answer has always been in man wget AND wget --help. (The latter is impossible to miss, as any incomplete or incorrect invocation suggests you use it.) If you need IRC to babysit you through a command that has comprehensive built-in help, well, you deserve what you get. Make an acronym of this: Try Harder Next Time.
So, what is shlomif's chance of getting the answer: 25%.100% if he uses man wget or simply wget itself.
IRC was the wrong avenue, as he may or may not learn. The fault is not IRC per se. "RTFM" is a valid response because what is required here is not the answer asked for, but the knowledge of where in general to find such answers. "Give a man a fish" versus "Teach a man to fish". The former does not scale. The latter does (and is the premise of education in general).
To your cases I would add:
5. Whether the respondent knows the answer is irrelevant; "RTFM" is appropriate when it is clear from context that answering the question of the instant will do no lasting good.