I'm not sure that the cost of a month's supply on this campaign is necessarily what it will ultimately cost in full production. The prices listed here, I assume, are what they think they need to charge to reach their 100k goal to enter mass production (based on how many people they expect will support the campaign). Ultimately they have a lot more costs than just the price of the ingredients, and their first run is likely to be more expensive than subsequent runs.
Exactly. If it really cost $65/week or whatever the Kickstarter is charging, why would they bother doing it? The whole point is apparently to raise funds to cover all the startup costs - of course you are paying more than the marginal cost of Soylent.