Sure, some cool bikes have gotten to market through crowd-funding, but I think the odds of getting scammed are insanely high. And even when it works-- for example, with the Nireeka Homie-- often full-price customers get their bikes before the insider-price crowd-funders.
I've been following the Avarax-e, which is supposed to be a $700 35-pound bike with front suspension and 250 or 500 watt hub drive, because I almost bought one... until I discovered this website, and realized that this is very likely not possible with an aluminum frame.
We'll see what happens, but so far I'm really glad I made some compromises, and got a $2500 bike (after mods) that's a less powerful than I thought wanted, but turned out to be exactly what I needed.