Chewing Gum

[xoxoxoBruce]

Wrigley has been selling chewing gum since 1891.
Wiki says...

The company currently sells its products in more than 180 countries and districts, maintains operations in over 50 countries, and has 21 production facilities in 14 countries including the United States, Mexico, Spain, the United Kingdom, France, the Czech Republic, Poland, Russia, China, India, Japan, Kenya, Taiwan, Australia, and New Zealand.

I would assume they know their shit by now. In the supermarket are plastic bags labeled 54 pieces containing three boxes of 18 pieces. Each 18 piece box contains two bubble-paks of 9 pieces each. On a bubble-pak there are two rows of five but they only need 9 so one goes to waste. Why?

Why would the not use that spot to make it 10, 20, 60? Like I said they ought to know their shit by now but this seems dumb. Am I the only one to wonder why? Maybe not, so that's why they clearly label the quantity at each step.