Let’s say in the course of a day, an innie belly button collects one gram of lint.
In a year, that’s 365 grams of lint collected.
That means that person’s dryer had to deal with 365 grams less of lint.
From Wal-Mart’s website, 160 Bounce-brand dryer sheets cost $6.84. That means about 4.275 cents per dryer sheet.
For now we will assume that the use of a belly button as an extra lint-trap acts to save one dryer sheet per year.
The life expectancy in the United States is 78.2 years, according to World Bank data from 2010. (Canadian friends, your average life expectancy is 80.8 years so you should really be paying attention.)
Given that an innie belly button saves one dryer sheet per year, the average life expectancy is 78.2 years, and the cost per dryer sheet (in today’s dollars) is 4.275 cents – an innie belly button can save you $3.34.
Innie belly buttons: they don’t just make sense, they make dollars.