The main wealth of the slave owner?

The main wealth was the presence of a slave. The more slaves a feudal lord has, the more wealthy he is. It was expensive to keep a slave, and besides, a slave could have a family, and he had to support it. There were special fairs for the rich, where any rich man could buy himself a couple of slaves. The most hardworking ones had a very high price point. Small huts were built for the slaves where they could live. All this was built from the pocket of the slave owner. Therefore, owning a servant has always been financially costly and considered the main value.