I disagree. If huge product failures/not-quite-scams-but-might-as-well-be keep happening, people will loose faith in the Kickstarter brand. This is them protecting themselves, and their community.
If the real motive is to prevent scams/failures-to-deliver, that's OK. But that's almost the opposite concern from the headline -- "not a store" -- about just using Kickstarter as a channel for moving already-developed, riskless product inventory.