Bummer. People are more worried about making a $1. You would think when someone asks $3 for shipping they would use a bubble mailer. Those sorting machines at the post office are card eaters and too risky to send better cards through. If you are sending a cheap base or low end insert then maybe use a PWE.
Well...if you file an official eBay complaint. The seller has to pay for you to send the card back and refund everything you've paid!
Most cases, where it's obviously the shippers fault, he may just tell you to keep the card and refund you.