1) Your annual income is determined by making one specific, arbitrary decision
2) It is possible to be observant enough to make the decision intelligently, but most are not able to perceive the clue clearly and must guess; this is reflected in an outcome distribution that skews towards a preponderance of incorrect answers
3) Making the decision correctly nets you $1 mil; incorrectly, $1,000
4) There are no other opportunities to make money
The inequality present in this system is largely a function of the magnitude of the spoils/demerits for being correct/incorrect, not the distribution of correct/incorrect answers.