Voted for

• I find it already difficult enough to allocate my daily quota of upvotes.
• It takes too much time for me to find posts where I consider a downvote to be appropriate.
• I would, but I'm afraid of retaliatory downvotes.
• Other reasons (please explain)

I've proved myself wrong already when I wanted to downvote but commented first and then understood what has not been going on with the massive upvote that has been given already.