I am still curious to know: why do people buy usernames? I have read about something similar to this before, but I couldn't wrap my head around why anyone would have to pay such a huge amount of money for a username. Could it be to buy the identity of the original owner of the name and use it to scam people or for any other reason best known to them?

I am already having the feeling that these scammers use this username stunt to lure their victims because it seems like one of the easiest things to sell in exchange for a lot of money.

Some scams are actually avoidable. Without being told, one can easily tell the offer isn't genuine. Thanks OP for bringing this here. It will motivate us all to be mindful of who we interact with both here in the forum and outside the forum.