I would seriously try to resolve the account with eBay.
One reason to do this... if in fact the hackers have comprimised your account you have to think of the negatives that these people may do in your good name.
Say for instance they put up an auction for a expensive item. Then a buyer buys it and pays. Then of course this person never ships it... what now happens is that your name is in association with the account. What can happen is the buyer could do an Internet Fraud claim against you IFCC,
http://www1.ifccfbi.gov/index.asp
If this fraudster decides to run multiple auctions under your name and say all those buyers have been ripped off what now can happen is that your good name is put on record... if you never tried to resolve the issue with eBay then you may find yourself liable. That is if a bad cop doesn't do more of an investigation.
I have seen bad things happen to good people as a result.
I was a victim as well but with PayPal, although everything is resolved now after almost 10 months I still refuse to use them...
If eBay does not put a proper investigation to the shill bidding you have a suit on your hands most certainly and there are people who have gone to the law to protect their name. eBay has certainly put some more focus on Customer Service and it's a great thing... I have certainly noticed a change in regards to certain things I deal with aside from my account listed here on AS.
If you notice that CS with eBay is a bit slow to your responses and semi vague. Try the
meg@ebay.com email and email her. She may not reply personally. I have had her marketing guy as well as other head honchos reply and all of them have provided a very personable email. You will get resolvement. They usually reply within 12hours to less then 24 even on weekends.
Don't think of eBay as a venue as they state. Think of it as a company like anyother who has your personal information on file. You need it resolved.