Titanium: Maybe the money from the failed projects will get recycled back into other projects. Depends on how each individual manages his/her finances.
overread: Well if the project fails to meet its starting quota they don't get any money at all. The money is only sent when the time limit it up and if the company has already met their project minimum amount.
No, I mean every single individual who donated. For instance, the $15 that I wanted to give to x project can now be given to y. But this is dependant on the assumption that some donors would give the money back into the loop and are limited only by their monthly spending.
A quick example:
I have $40
I donate to 3 projects: 15 to x; 15 to y and 10 to z
y falls through, now I have $15 to donate somewhere else. If I want to, of course.