I am sure this is true, but very specifically getting to just the level of above 40m, it can't hurt, can it? I am not saying if you fund them later they will become dropbox, just have a higher likelihood of hitting 40-50m
Dropbox is an ironic example, because Drew applied right before the deadline with a video, a string-and-wires prototype, and no cofounder. He'd been working on it 3 months and had just barely quit his day job.