I agree that there absolutely should be an answer to this very simple question. However, it's pretty well known by this point that that's never going to happen, as Fen himself has more or less said as much. Another reason this question is met with hostility: a simple search of the forums by someone who is curious would turn up one of the previous discussions of this topic. Or, if someone is too lazy to use the search function, then they could, to borrow an old adage here, "lurk moar."
As for my commissions, I make things clear up front. I let commissioners know that I have medical issues that often preclude writing, as well as real life obligations that often complicate things as well. I make no promises at all as to when something will be written, and that's exactly why I only take money for my projects when it's done. Even if I did take half the money beforehand, then I would still make it as clear as possible to the commissioner what they're getting into.
It's much the same with backing this game: caveat emptor. It's good for someone to check this sort of thing before backing, but people are frequently quite hostile to these inquiries because there have been countless people with buyer's remorse making these sorts of threads, or even just people who could have used the search function on the forums for its intended purpose to do their research. People are tired of answering the same question again and again (not just on this topic), and that's quite reasonable when there are multiple ways to find the answer to most common questions without making yet another thread that's just a rehash of an old one.