Discussing nominal profits when comparing various businesses' "profitability" is almost never productive.
Any business needs a certain amount of cushion to counter volatility, and to earn a return for shareholders. If you had a business with $1M of revenue and $20k of profit, surely you would not expect $20k of profit when you hit $2M of revenue (because 2% profit margin is objectively very low. I have yet to see of successful businesses operate year after year on less than that, and at 0% they become a charity).
Hence profit margin is almost always the relevant figure, especially when you get down to the low single digit percentages.
Any business needs a certain amount of cushion to counter volatility, and to earn a return for shareholders. If you had a business with $1M of revenue and $20k of profit, surely you would not expect $20k of profit when you hit $2M of revenue (because 2% profit margin is objectively very low. I have yet to see of successful businesses operate year after year on less than that, and at 0% they become a charity).
Hence profit margin is almost always the relevant figure, especially when you get down to the low single digit percentages.