Here is someone who did a test to see if (most/some) people are honest.
"It took 4 days for Louis to earn $200,000, and another 8 days to earn a whopping $1 million."
Louis CK Earns $1 Million in 12 Days With $5 Video
Most people don't have the background/preparation/reputation/etc. to do this, but it certainly shows that it can be done.