People wanted these jobs because government officials were respected and enjoyed privileges, such as being excused from taxes and military service.
It was "Francois Rabelais" who wrote the humorous novel Pantagruel, published in 1532, which poked fun at the established order, since this was during a time when many voices of "protest" made their way through literary works such as this.
Knights protected and served their lords in exchange for land.
They work in order to eat.