EBay won't suspend you just for using an IP that another suspended user has used. EBay won't shoot first when it comes to this. Think about it. A lot of people access their accounts from public places that share IPs, and eBay doesn't touch those accounts. If an IP is used over and over again between users, eBay knows its public and will need more hard evidence before it suspends an account. Example, cookies and contact information.
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