1) 90% of all statistics are made up, includingthis one.
2) Ever think they could be simply afk at the time?
3) Or if they are there, perhaps they are chatting in guild/group and simply didn't see your text.
4) Or if they are in a group and currently chatting, perhaps they ignore you becuase you interrupted thier conversation.
5) Or perhaps you get ignored, simply becuase you don't ask in a nce enough way. As in, "Excuse me good sir/madam, I'm sorry to be a bother, but do you happen to know they way out of the here?" as opposed to
"he yyou, where is teh exit!!1one" will get you alot farther with others.
6) Perhaps they simply ignore you as you said. I ignore quite a few people in real life, afterall, I'm not going to just strike up a conversation with every random Joe of Jill that greets me. I've got things to do, places to be afterall. But the least I do is I say I can't talk to them for stated reasons before I run off. I don't see why it doesn't have to be any different in the game world.