And they do sell a bunch of 'em, according to Wikipedia,
About 55% of all CPUs sold in the world are 8-bit microcontrollers and microprocessors. According to Semico, over four billion 8-bit microcontrollers were sold in 2006.[4]
A typical home in a developed country is likely to have only four general-purpose microprocessors but around three dozen microcontrollers. A typical mid-range automobile has as many as 30 or more microcontrollers. They can also be found in many electrical devices such as washing machines, microwave ovens, and telephones.
Perhaps not surprising but still impressive numbers. I imagine a lot of the folks here on the forum don't have "typical" homes with a mere three dozen MCUs 