1) it's really weird. He's the richest man in the world, and he's spending his time by pretending to be good at video games? Humanly, it's just darkly fascinating.

2) an important part of his public persona is that he's supposed to be genuinely super smart and capable at everything. Many employees and other related figures have attested to him having preternatural abilities at rocket and car engineering.

If he is willing to make under the table payments and shamelessly pass off other people's work as his own for such an insignificant feat as being good at video games, what does that say about his involvement with actually important things? The parallel is very easy to draw.