One way to hold this word: it moves the whole sentence onto the buying-and-selling side of life. Picture a thing being made not for the person who makes it, but for a stranger who will pay for it. Follow that thing along: first it is grown, caught or built in quantity because it is meant to be sold; then it reaches a shelf, where anyone can buy it; and at the end someone counts the money and asks whether it paid. Each step is one of the word's uses.
From the word’s history
Wiktionary records commercially as commercial plus -ly, with commercial borrowed from French. Commercial means to do with trade, and -ly turns it into a word about the way or the angle, so the whole word points at the trade side of whatever is being discussed.
Wiktionary 記錄 commercially 由 commercial 加 -ly 組成，而 commercial 借自法文。commercial 的意思是「跟買賣有關的」，-ly 則把它變成講方式和角度的副詞。所以整個字可以想成：把話題轉到買賣那一邊。
Wiktionary entry for commercially, etymology tree: French commercial (borrowed) > English commercial + -ly (packet source_ref kaikki:3f6f69a190036ae4:1140080996)
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