Kickstarter isn't a preorder system. It's used to allow projects to get off the ground when they would otherwise have more trouble obtaining funding. Game Salute probably does not have the resources to design a game from the ground up without investor help. Their primary business is manufacturing and fulfillment (shipping). I don't know the exact business model, but I suspect they take a cut for manufacturing, shipping, and profit, then give the designers the rest. If they're having to shell out for initial design costs as well, it could currently be prohibitive to get into that business.
Game Salute seems to manufacture according to the cost each designer wants to pay per unit. Paint the Line uses cheaper materials, probably because that's what the Penny Arcade guys decided to use. Everything in the set was designed by PA and the game company they worked with (can't remember offhand). The difference can be seen when looking at other Game Salute/Springboard titles. I just received Exile Sun, which has a completely different design aesthetic, higher quality materials, plastic components, and a well-made control card with sliding pieces of paper. It's put together better than PtL; then again, it costs more.
