I am posting my 2 cents for what it is worth. First in this day and age, anyone can sue the next anyone for anything. Reguardless of false or factual information.
However ... Ebay has it's own set of instructions and policies in which buyer and seller enter into, including the use of a rating system to help buyers and sellers with transactions in which they may buy and sell at their discretion based upon factual or false information the rating system may present at a given time. (it is opinion based if you read feedback of sellers and buyers)
Also, if (God forbid) someone were to persure a suit against MUT or the people on this forum, for allowing an opiniun to be posted OR to post their own opiniun. I think Tony or one of the mods would remove the thread and hence hopefully keep the peace.
I tend to think though ... many of the "bad" sellers, are in that area of the list because there has been a proven track record, from ebay, from MUT, from several of the other make up forums, etc (there is usally a common thread and them based on the number of people complianing about a particular seller) ... that they 1. know they have mis represented, mis informed, mislead, mis used or any of the other mis ... whatevers, that they know they can not hide. 2. They know they have earned the title 3. they also know negative feedback will travel 10 times faster than good <what are they gonna do go after every single make up forum, blog, etc out there? and there are lots>
Ebay is a chance. For both buyer and seller. Many of the sellers are not big conglomerates or corporations. Most are small shops trying to make extra money to make ends meet. Many are genuine and honest. Some that have the bad title, may have had a bad row (you can usually tell if something is occuring in their personal life... it will be great for quite awhile and then a fall.) these people usually let you know and try to work things out. Then there are the scammers trying to make a quick buck of well intenioned buyers.
Boils down to each persons right to an opinion and sharing that opinion.
(ps. I do not think <I could be wrong> but the "bad" list of sellers were not just 1 person saying they were bad ... it is more like several ... all about track record)