And Godfang, I want to stress that I don't doubt your ability to make the product. But DoubleFine is still a good example, among others. Most people have a basic idea as to what they believe the demand will be, but sometimes, if you get a lot of people, suddenly the demand ramps up several hundreds of times, and although the company in question could have the infrastructure in place for a couple 10's of thousands of copies, they suddenly have to redesign their outlet chain, their manufacturing chain (if they have a physical product) and then there are the unforeseen. Printing issues, shipping issues, artists (both in this case Video and Physical Media) unable to make it on time. And other general delays.
It's nice if the devs (and they SHOULD) keep you apprised on any snafus or other things, but it doesn't change the fact that there's a lot that could happen that could delay, or even halt a project. I'm not much of a gambler, I'd rather pay for a 'sure thing' than a 'good chance'.
So here's hoping you get your funds and you get your game out on time! Good luck!