Ebay don't want to be too strict with there policing, because if you took away all the fakes there would be no Ebay.
Actually that not true. There are millions of legitimate sellers selling good usable products. Solving this problem would benifit ebay more then hurt it.
Ebay is very strict on selling fakes. But ebay has to prove that the items are fakes. When you have 5 million sellers on ebay and a staff of only 4000 employees. In which over 300 of them try to monitor the site. With over 35 million auctions closing each day. Thats a big margin of auctions ebay has to pay attention to. They rely more on buyer feedback then you realize. If you yourself dont report these scammers then ebay has little they can do. But ebay is banning people left and right to fight this problem but it will never end because ebay is way to large to totally control.
You see the commercials for ubid stating 100% fraud guarantee?
That is because thier screening process is so strict that very few bother to register. They think they can be the next ebay. But thats very doubtfull. If they were as large as ebay they would have the same problems, but they wont be just because the average housewife cant sell her junk in the closet without registering a company and going through thier strict policies.