For all those who don't understand how to answer the spirit of a question, here is a question for you to ponder, with enough specifics added that you'll need to try really hard if you want to make your answer stupid:
A magical extra-terrestrial wizard appears to you. He tells you that for the next thirty Earth-days, you have the opportunity to take his challenge.
The challenge is that you and another human, chosen completely at random from all American citizens excluding yourself, will be safely and instantly transported to a 400m track. Approximately 60 minutes later, the two of you will race one Mile in accordance with USATF rules. It will be 50°F, cloudy, and dry. The track will be well-lit. You and your competitor will have access to whatever (USATF-approved) shoes, clothes, nutrition, and amenities you like. Your competitor has been told that they will be killed if they lose; the wizard has assured you, however, that they will not actually be killed--so you do not need to feel guilt about being the cause of someone's death. You are not allowed to make any deals with your competitor that might cause them to give less than their best effort. The wizard will also perform a 100%-accurate drug test; a positive test for an intentionally-consumed performance-enhancing drug is grounds for disqualification. Other intentional rule-breaking is also grounds for disqualification; unintentional rule-breaking (such as an accidental flinch for a false start, or an accidental mid-race collision) will cause the race to be restarted. A disqualification is equivalent to a loss.
If you lose the race, you will immediately be killed (shot in the head until dead), and those who knew you will learn that it was because you accepted a one-mile race against a random American, with a $1 million prize for winning and death for losing. They will not know about the magical extra-terrestrial wizard, but they will assume that the competition was fair.
If you win the race, you are awarded one million US Dollars, and you are safely transported back to your original location, at the time at which you accepted the challenge. No one but you will know that you were gone or that a race occurred.
You may accept the challenge as many times as you wish at any point within the 30-day window (unless you're dead). At the end of said window, the money will be awarded to you by means of a winning lottery ticket whose prize, after taxes are deducted, will be equal to your winnings. No one will know that you earned the money by winning (a) race(s).
One of the magical extra-terrestrial wizard's magical powers is the ability to convince anyone of anything. Because of this, you have zero doubt that everything he has told you is true.
Do you accept his challenge? If you win, do you accept it again? How many times?