Elvis Presley allegedly had an IQ of 70, but I don't think he exhibited characteristics of being "slow." He certainly earned a lot of money.
I always got high scores on standardized tests, but have always earned a low income. As others have said, IQ is only a "good start" at best. I am thankful that, in middle age, I got a job with a good retirement plan. Otherwise, I'd be in subsidized housing or on the street.