It's not a terrible thing to do though, because it also reflects uncertainty in your income, albeit in a way that people aren't used to seeing. There is a non-zero chance that 10 million dollars today will end up being 3 million dollars next year, and I don't mean "next year" metaphorically, and I'm not even talking about the nastiness of the current economy, either; that's always true, regardless of the state of the economy, just the odds change.