You mistake the average for
You mistake the average for the means. Jay Leno bought a Volt as did a few other very wealthy people. Their incomes, totaling in the millions skews the average up a lot. I know several people who bought LEAFs and Volts and none of them, myself included, make more than 100K. I'm less than $60K.
These cars are very affordable for anyone making at least $50K.