Agreed.
But what else to they have up their sleeve? They might add new levels that turn out more attractive, if they determine it is needed to push it past the finish line.
they did not plan their kickstarter project carefully. they need to have more rewards in the lower tier and upper tier: t-shirts, stickers, custom color on the phone, extra customization, extra ram, extra cpu etc.
Still a great kickstarter - if they raise the amount = they can show manufacturers that there is demand for ubuntu. if the don't, they still gain quite a bit of awareness of the ubuntu mobile OS.