For not shipping fast enough, not playing by their rules, and just in spite!!! Also predict paypal claim and money lost!!!
I am still leaving feedback after them!! Cuz I want to be sure everything is smooth and if I do need to warn. I always look at their feedback to see if there is any pattern before I leave negative feedback to make my decision.
It is not looking good for the future!
Here is one example
http://blogs.ebay.com/faststuff04/entry/The-Worst-Ebay-Store-I-have-experienced/_W0QQcommentsyncidZ490050018QQidZ490031018