Right. Like, first of all, stop watching tv.

Second of all, there is tons of TV about normal people. Like, most of it.

Third, yes, the rich and powerful are overrepresented on tv. Why? Because people like to watch that shit. They know what their own lives are like, and they are boring - people want to watch a show that is interesting. Being rich and/or powerful is an easy way to make a story compelling, and gives writers an obvious way to make up ludicrous plot points.