In an elected system, the representatives are to a degree self-selecting for their enthusiasm for the job. Under a system of pure, universal sortition the individuals are not chosen for their enthusiasm.  Many electoral systems assign to those chosen a role as representing their constituents; a complex job with a significant workload. Elected representative choose to accept any additional workload; voters can also choose those representatives most willing to accept the burden involved in being a representative. Individuals chosen at random from a comprehensive pool of citizens have no particular enthusiasm for their role and therefore may not make good advocates for a constituency. 
Throughout the story the reader is able to clearly see how Jackson uses setting, tone, and symbols to create a very entertaining story. The setting and tone in "The Lottery" is very different than most. She tricks the reader into thinking that the town and village people she describes are normal, when in reality this is not true. The reader later finds out about the unusual ritual this town practices and the entire tone of the story changes. There are two main symbols in this story, one being old man Warner, and the second being the black box. Both of these symbols give the reader a sense of tradition, with Mr. Warner not wanting to stop the lottery, and with the black box being nothing more than a symbol. Jackson leaves her audience with a great theme that can be applied to any society and any time period.