I noticed that there a lot of questions that are flagged as community wiki, even if there is not that much answers or are quite new. For instance there are 10 questions on the homepage currently. Is there a new policy about this flag? Because I though it was a flag to avoid huge reputation gain on one post.
If you search for Community Wiki questions and sort by active you'll see that there's only one Community Wiki question that's been active in the last few days - yours.
The reason this was converted to Community Wiki is the last line in your post:
This turns it into a polling question - a question where there isn't a single, correct answer but a case where you solicit different answers from different people. The reason why such questions are converted to Community Wiki is twofold: