Just to give you a data point, I don't know if my answers are right in about 1/3 of all the replies, often because the questions are phrased ambiguously.

A few small bits of advice:

• Do answer if you think your post might add something of value, even if you're not convinced it's right
• If you think a question is ambiguous, say so. Point out possible interpretations, and mention on which one you base your answer.
• If you have doubts about the correctness of your answer, mention them.
• Follow-up questions can lead to interesting discussions, feel free to ask them.
• Even if many good answers were given, I appreciate links to old discussions of the same (or similar) topics