I think that the number and quality of responses are probably the essence, more quality than volume.
The way I work is to scan for questions that I either want to read for my own benefit, or those that I think I can offer some helpful insight. Quite a few responses appear to be quick and without taking into account two important things:
1. What did the person really want to know? Sometimes people don't know how to pose their question, and when you read their amplification after the question, you go 'oh, so what they probably mean is..."
2. Not reading the responses the precede yours. I have learned a LOT from other people's answers and try to make certain that if I do post a response, that it focuses on an aspect that has not yet been addressed, or perhaps from a different perspective.