Coffee makers are some of the few devices where this makes sense. While commercial things can occasionally save money, they usually don't. Furthermore, the TCO calculation has to take into account what you would have done with the same amount of money. Let's pretend you buy a $2000 commercial grade widget instead of the $500 consumer grade widget. Over ten years of use, your commercial grade widget cost $100 in parts, running and maintenance costs, and depreciated to a value of $1800; during the same time, the consumer grade widget would have required about $50 in parts, running and maintenence but would have depreciated to a value of near zero.
So, you might think, your TCO of the commercial grade widget is $300 and the consumer grade is $550. Easy win for the commercial widget! But then factor in the potential uses of that extra $1500 upfront. Assuming you were earning an average of 3% on your cash during that period, you would have made $515 on 10 years' interest on $1500. Now, put your money into an index fund, and your returns would be (historically speaking) thousands of dollars.
(Before the inevitable comment, there are plenty of ways to earn a return on money that don't involve an index fund. Investing in your home, high interest savings accounts, Treasuries, paying down any debt, etc etc.)
So you can easily see that for most things - where maintenance is cheap - it's not worth it. This includes most white goods, almost all electronics, etc. Where maintenance is expensive, though, you can save a lot by buying commercial. The classical example is the Isuzu crew cab trucks: if you do need to haul a lot of stuff, they're far cheaper in every way than comparable consumer options.