as I mentioned requiring a signature doesn't make the delivery immune to theft.
I would contend it makes theft far less likely as the item must be delivered to, and signed for by, someone who answers the door at the shipping address.
you need as a consumer to verify everything in advance
As a merchant they need to ensure doing business with them isn't such an onerous task that it would be easier to shop elsewhere. For $30 (plus shipping) they've ensured they'll never get any more of my business, and that I've gone out of my way to post a negative comment about them. I hope it was worth it to them. :)
Apparently my credit card company decided the merchant's excuse was lame and there's now a credit for the purchase on my statement.