My response in that thread was due to only minutes earlier, having been asked by the OP to boost him in dungeons.
This is something that several new players do, usually without making any effort to find out if a paying player is already in a dungeon, or a battle ground (the effort to look at the friends list obviously being too much). They frequently request boosts the instant you log in, and never seem to take into consideration the fact that someone with a payed account might wish to actually play on their account, and that they aren't here on AP solely to pander to the whims of F2P players.
I can't speak for other owners of high level characters, but I'm not even going to grace those requests with a response. In every single guild that I have been in since I started playing WoW in TBC, begging higher levelled members for boosts would be grounds for a /gkick. Boosts would be offered at the discretion of the person owning the high level character, as and when they had the time and inclination to do so. At the most players could mention in chat that they would like some help, but asking specific members or pushing the matter was unacceptable.
Also, as a booster for 19 twink guilds, I came to recognise 2 extremes amongst the players joining the guilds:
There were those who asked where to find information, did their research, got as much gear as they could, and then asked to be taken to specific dungeons for specific items that they were having no luck on with drops. These players usually went on to be long time members of the guild, and in turn supported other new players.
Then there were the ones who wanted every question answered, never made any effort to find out anything for themselves (or follow up on information that was given to them), wouldn't make any effort to group up and get gear for themselves, and proceeded to ask if every item that dropped in a boosting run was something they needed. They were usually chronically bad players, from never actually playing their class as they levelled it, and could pretty much be guaranteed to leave the guild in a couple of weeks, once everyone had got sick of them, and put them on ignore.
As someone who is willing to make an effort to help others take part in twinking, I do not like having my time wasted by players who obviously are not going to make any effort themselves, when my time could better be spent helping those who do.
If you would like someone to commit time to helping you, then you should demonstrate that you are worth that time.
And as far as questions on forums go, you shouldn't be asking the kind of questions that can be answered in under 10 seconds by entering the same text/keywords into a search tool. By the time someone responds on a forum, you could have easily found out everything you wanted to know by yourself, and more (and they will more than likely only do what you couldn't be bothered to). If not, then you have a worthy question. People have usually taken the time to make guides, specifically so they don't have to answer the same questions repeatedly. By not making an effort to find out if those guides exist, you are disrespecting the effort that people have made in making them. And like me they will be less likely to help in future, if their efforts are shown to be a waste of time.