Margin as a % is a key metric, more so than margin as a $. It's not always sensical but it's dominant in the business/investment community. For example, you ma

Margin as a % is a key metric, more so than margin as a $. It's not always sensical but it's dominant in the business/investment community. For example, you may announce to public markets that your profit has increased $10M despite margins eroding from 50% to 30%. You will likely be punished in terms of stock price. This is because you sold a lot more or trimmed some expenses (which is short-term good) but you are also now more risky because if sales decrease you will more easily run into trouble breaking even/covering operating costs (which is long-term bad).