It's nearly impossible for people to truly grasp that $500,000/year for 50,000 employees is the same impact as $10/year/employee. Even incredibly smart people get this wrong. It happens in business, in politics (see all the people arguing that policy X that works in country Y can't be implemented in the US because the US is Z times larger than Y), everywhere, even with people who otherwise have a very strong grasp of math and science.

It's baffling.