1) Backers will see a KS as more 'trust worthy' than directly backing an individual, see even if the KS hasn't brought in a lot of new people, it probably has allowed people who have seen the figures on forums to be more likely to pledge for them.
I don't know if I buy in to the whole "trust worthy" thing. I haven't been burned on KS but apparently others have. There's a guy over on my recent TGN post saying that that's why I need more "hand holding" updates, which I've avoided because I personally loathe updates that say absolutely nothing has changed.
I can see your second point about getting the money though, the closest thing I can come with with that mimics the Kickstarter model would be a "the more you buy, the more you save" sale to help fund a new unit, and when that new unit is available you would get it shipped to you (free) for the sale price. That would mean I'm affectively absorbing the second shipping cost, which may or may not be cheaper than the 10% fees.
In any case, it's been a learning experience. If I do another one I don't think I'll be announcing any stretch goals ahead of time, if only to see if it reduces the number of cancellations/pledge reductions.