There is so much involved in this project that simply isn't financial.
Going through the process of putting up the Kickstarter project creates accountability and motivation for Mackenzie to actually build and finish the game because she now has a group of people cheering her on from the sidelines.
To me this is exactly what Kickstarter is about: supporting creative endeavors. The financial aspect of it is secondary...don't you think Kirsten Bell could just bankroll the $2m Veronica Mars movie herself? Probably. But with Kickstarter you get the benefit of a built-in support group, and I am just as happy to support Mackenzie whether she's from a rich or poor family.