Ok, I get that. What I meant was, what's their legal justification?
Ebay is a private marketplace. I don't need a reason to kick you out of my house.
Agreed. People on the Internet seem to always demand companies to act in accordance with some law that does not apply. Freedom of speech is a fantastic thing. However, it does not mean that you can walk into a restaurant and scream at the patrons and the owner is somehow unable to kick you out. Same thing happens online on sites like Digg where "censorship" is usually greeted with "it is my constitutional right..." By the same token most businesses can refuse to do business with you, and frankly more should. The "customer is always right" mantra is not a dogma. If a client is toxic, cut your loses. It's better than getting ulcers, I hear. I'll get off the soap box now.