I did like Charles Dickens who has Mr Micawber say ‘Annual income 20 pounds, annual expenditure 19 [pounds] 19 [shillings] and six [pence], result happiness. Annual income 20 pounds, annual expenditure 20 pounds ought and six, result misery.’

I'll take advantage of the simplistic calculation. If you give me all your money, I'll give you back all your money plus N (N guaranteed to be a positive number). Now, I'll give it back in 10 years, but you'll have definitely made money. Or, in your terms "hells yeah"!

Ha. But a pedantic take at face value:

This doesn't work on a low level, such as: If you're looking at an account you want to balance to 0, e.g. a suspense account, prepayment account, etc.

Also doesn't work with practical application, such as: Catering for a profitability target e.g. ($in / $out) > 1.1

Over a sufficiently long time period, net profit equals cash in minus cash out.