Why don't they just create the product and have me pay for it? The company is already funded, why should I go ahead and pre-order something now, knowing it migh

Why don't they just create the product and have me pay for it? The company is already funded, why should I go ahead and pre-order something now, knowing it might not work as advertised when it's ready. I'd much rather pay $300 when the product is on the shelf, when I can evaluate the pro's and con's. Sure, if this was a project that hasn't been started and looked very promising, I would give it some money, for a chance to get something great. In this case, it seems I don't have to risk, but rather just have to wait.