There's reasons besides unfalsifiability for downvoting. Like poor logic, or asserting p=1, or writing so melodramatically that my eyes glazed over.

Edit: I stand by my downvote, for the last two reasons, but I'll give him props for a correct prediction.

Thanks for having my back, but I have to ask if I've missed the boat on some Less Wrong policies or unspoken understandings somewhere. What I said may have been a testable prediction, but I wasn't aware that people's posts had to be testable predictions to deserve upvotes. Am I required to list all my supporting evidence every time I make a future-looking statement? If I don't, or even if I do, must I disclaim them the way corporations do on quarterly earnings conference calls?

gwern said above that (s)he'd "be happy to record" my prediction. I had no idea my predictions were being recorded at all. I thought this was just a discussion forum. Is Less Wrong actually a simulation of the prediction markets from Three Worlds Collide? Is Less Wrong a subsidiary of Intrade? Do I have cash or prizes waiting for me somewhere thanks to one of my earlier correct predictions?

I can also make the testable prediction "The universe will cease to exist on May 19th, 2034 at 10:03:09PM", but unless I had some truly excellent supporting evidence which I posted along with that prediction, I would not expect people to think well of my statement (particularly if I made it in a rambling, melodramatic way that made it difficult to determine the purpose of the post).