Que Paso Lurker?

Why do people lurk? I understand the occasional Lurker just surfing/stumbling upon things but I don't quite get why someone would read a random blog like this several times a day every day regularly and never comment. When people are kind of tied in loosely to this gringa/Chile/ExPat community I can understand checking it out regularly and perhaps not commenting. When someone is clearly outside of that and I think has no connection whatsoever to this community checking this blog out regularly it gives me a weird vibe. My blog is NOT that cool and there are MUCH more interesting ones out there. This has made me start to think about why people lurk. Maybe it's just that I'm really outgoing and seem to have something to say about almost anything but there are no blogs that I read regularly that I don't at least comment every once in a while. Anyone else have any insight? Do any bloggers out there have regular Lurkers? Maybe someone reading this who has never commented can tell me why they don't comment?