I don't know how it works in Germany, but in most states of the U.S. Small Claims Court cannot issue process for compelling payment of judgments. The case has to be transferred to a court of higher jurisdiction for issuance of, for example, the attachment of a bank account. You know how to do this?
Small claims court cannot take a case without personal jurisdiction over the defendant.
And, of course, a civil judgement is no better than the ability of the judgment debtor to pay. Lots of judgments against Enron are outstanding.
I'm not German, I just live here. I've had the unfortunate experience of dealing with small claims in the U.S. before though.
Small claims would have to be filed in whatever state "Gene's" business belongs to. I was skeptical of the claims that Gene isn't who he says he is at first, but I'm starting to become convinced because of what's going on and his lack of communication. So, assuming somebody wanted to sue him in small claims and was able to get the right information, there are ways to collect. Bank levies, wage garnishments, and real estate liens would be the most common. These would be accomplished accordingly by getting a writ of execution, writ of garnishment, or writ of attachment from the court where one's case was originally heard. Then one would have the distinct pleasure of trying to serve the defendant with said papers, hopefully the local Sheriff would be able and willing to help out in that regard. But at the end of the day, you are correct; Can't get blood from a stone. I'm just saying that there are options here, how successful they would be remains to be seen (I hope).