I would contact a REPUTABLE Class Action Lawsuit Firm. I have seen very similar cases on multiple sites stating the same or similar problems with EBay. With a class action suit, I do believe, but may be wrong, that no one pays out of pocket for the attorneys fees as they are included as part of the suit or they get a percentage of the amount awarded to the plaintiffs. The attorneys can guide you in how to proceed. When you are going up against a large corporation like EBay, I believe it is better to attack back with as many wronged people as possible. This tactic will provide more credibility to your claims because you are not the only one claiming to have been wronged by the company and the more people involved in the lawsuit the better.
Yes, you can sue for financial awards for this because you can sue for defamation of character, loss of earnings, and I believe there are other things because they have cause great damage to your reputation as a business owner, caused you to not only lose income from sales but also repeat customers who no longer will purchase products from you because of it and the loss of potentially new customers, but you will need to consult an attorney on this as well.
If you go to U.S. News' website, they have a list of the "Best Law Firms -- Nationwide Results for "Mass Tort Litigation / Class Actions - Plaintiffs" which includes the names of the firms, along with a list of their clients.
Here is the web address that will take you straight to the page. I recommend that you do a Google search by entering the firms name and the words "reviews, comments, and complaints" after each one you choose and check with the better business bureau just to make sure they are everything you want them to be.
U.S News website address:
You have to sue in the U.S. because that is where EBay is based. Also, make certain before contacting an attorney you read and print out a current copy of Ebay's user and seller's agreements so you know their policies, especially concerning litigation.