The reason is that I work about 4 miles from where I live in the Del Mar area. My 10 - 15 minute commute home every evening is now taking 30 - 60+ minutes! As soon as the fair is done then racing season starts... we don't get a break all summer! Fridays are really bad during racing season because of the late start and concerts.
I don't think the owners/ promoters of these events give any thought to the many thousands of people that are put out for 3 months and we get nothing out of it.