Especially when we talk about ancient societies, like in Egypt or Mesoamerica, we often talk about the achievements and wealth of the most powerful.
I think at least partially, this is because they left the largest and most durable artifacts, so we can evaluate pyramids and statues and tombs and so on.
Another factor is that written history has often been a luxury, so histories are often written only about kings, lords, and emperors. That's the info we have now.