You mean there are things on e-bay that are not fake knockoff s.Ok now that you have gone public with your fake knockoff products, the makers of the real products can find you and sue you.
If some one reports your item as a fake then ebay will pull it, especially if it is a designer item such as a bag.Do it a 2nd time and ebay will send you a link to a tutorial about what you can and cannot sell on ebay. You need to click through all 20 pages. You will also be banned for 1 week.Get caught a 3rd time and ebay will ban you from the site forever.Realistically you will not get sued by anyone (regardless of what others tell you). Your biggest problem is the people you are trying to rip off. They may be less than happy with your fake goods.
It depends on the fakes.Example, if you sell an item that has the Nike name or logo on it and it is not made by Nike you can get sued by Nike. It is worse if you say it is made by Nike.If you sell an item that looks like a Nike item but there is no name on it and you don t identify the manufacturer you may be able to pull it off as a look alike item.
for actual counterfeits: ebay will shut you down very quickly. the real company can sue you and/or complain to law enforecement.