你好啊？ or 你好吗？ Which is more common? I have recently come across the phrase 你好啊 and I was curious about its usage. It was in the FSI Chinese course with a meaning of 'How are you?', but I have only heard 你好吗 on other courses and when talking to Chinese speakers on Skype. Is this because 你好啊 is not really used very much in everyday life, or is it because Chinese speakers tend to tailor the way they say things to suit the level of the other person and 你好吗 is more common in text books?
Usually people just say 你好 because, well, it's just the common way. I don't think there are any reasons.

你好啊 sounds like talking to babies, or if you are greeting someone who is some distance away and you want yourself to be heard. 你——好——啊——

你好吗 is a direct translation of "How are you?" It is only used by Chinese when one really wants to know what is going on with the other, or it may be used with English speakers to make them feel less culturally alienated.