Let's come up with a nickname sale; it'll be fun. The recent news that the Telegram nickname was sold for two million bucks is good motivation for those who want to throw their money away.
How foolish must someone be to do such things. Doing these kinds of actions is simply like pushing one’s own money towards waste. Still, there are many scammers who buy these and try to carry out scams. But they cannot go very far with it and in the end it is seen that their efforts and money are wasted for nothing.
Last month, someone wanted to use my nickname to punish me for seemingly interfering in someone's life on the forum.

At one time, when I used to watch different movies on the screen, I would hear the names of celebrity personalities, then in class, during free time and playtime, I would call my friends by matching those movie celebrity names saw on the screen. Here I can see the same thing has happened with you, because it feels like you have become very popular, that's why others are trying to copy your name and use it.

Although there really is no problem with the same nicknames. In order for a scammer to achieve his goal, as OP writes, you need to at least stay on this forum for a while and go unnoticed, while newcomers are very impatient with their revenge.
If it were really that easy, from the beginning of the forum till now, people could have been creating accounts with names similar to those who have good reputation and using them to scam regularly, but nothing like that has really happened in the forum. Even if a new account is opened with a name similar to a reputable account, it is not possible to carry out fraud just like that.
On the other hand, I feel that those who try to take revenge are actually not new in this forum because they may have an old account on which some action was taken and to express their anger or frustration, they create another account with a similar name and try to take revenge, (not fully sure about this, but this is how it seems to me.)