Yeah, very true. Great points!
I assume that some or most of his +700 feedback was purchasing cards. I would also guess that he noticed how all of those cards were packaged, and should have had a good idea of how to package his. A tight budget is never an excuse for shoddy packing, either. If someone buys or trades for something, they've paid or put up enough collateral to ensure that they will get their card damage free.
-Casey