One thing you will see a ton of on ebay is fake Nazi rings. Many of them, if real, would sell for around $20,000; yet you can get one on ebay for just $200-$800. Imagine that.
Why buyers don’t put in a little time to research what they think they’re buying is beyond me. Scroll down a little and you will see the exact same ring sold by two different vendors at the same time; pretty odd for something so “rare”.