Welcome to the forum. I see that you've read the Ebay posts, and most importantly, found toolhaus.org, which is the easiest way to cut to the chase. As to stopping someone by outing their name and links, we've seen that they simply open up under a new ID.
Does Ebay or Paypal investigate? Well, somewhat, but not much. My impression is that they try to mediate (Paypal less than Ebay - they seem to have very little customer service), but what they do really doesn't have teeth. For that to happen, there would have to be things like lawsuits or reports to credit agencies, and I don't see them doing that - they don't have enough staff, and I'm nearly sure they would deem it too much expense and time.
If someone generated an egregious number of complaints to Paypal, maybe they'd do one of their notorious account freezings, but that's only a guess, and that wouldn't get you your money back anyway, I think.
Unfortunately, feedback and good communication are your best defenses. I have a couple little tricks I like to use that may help some, and I've already given details of those in the Ebay complaint section.
Sorry to be a downer,