As a French native speaker (from France) I'm sometimes surprised to read answers that go against what seems right to me spontaneously.
Obviously the most frequent reason is that the answer comes from native speakers of different areas of the Francophonie, where different idiomatic turns of speech may appear.
In such cases, that's a pretty interesting occasion to learn more about the language, provided we are informed of the involved area.
More rarely answers may come from non-native speakers who have acquired extensive knowledge of French so they can give pertinent answers.
But, no offense, sometimes they however may be simply wrong, so it'd be important to know they're not native speakers.
From these two reasons I wonder if it wouldn'd be a good idea to make this information mandatory in the profile, and always displayed in the signature block of answers and comments?