They sure can sue you. Google have already threatened legal action on several people with "google" in the domain name. Ebay is a trademark of that company, and the name belongs to them.
If ebay didn't like what you were doing, they would have grounds to sue you. Just look on DP for some related threat regarding google.
I have a few domains with good 'ebay suspension' keywords in them that forward to this site. But I have noticed ebay has a few of those domains as well or someone else, that forwards to eBay?