If something is discovered on Mars that could make one RICH, we will soon be living there.
Economics has been the prime driving force throughout all of human history.
If Mars were covered with diamonds and uranium (it isn't), there would still be no way to get at them that wouldn't cost more than the diamonds and uranium. 140 million miles is a long way to travel.
Not saying there will never be an easier or cheaper way to get there, but under current technology it's simply not practical.