There are quite some question type "is $3000 enough for two weeks in Europe", "is $300 enough for train itinerary in Central Europe" etc.
There are two issues with these, one is ambiguity of
$ sign (USD/CAD/AUD etc), which has been mentioned in Rules for prices - do we have them?
But another issue is that to answer the question you must convert local currency to the currency of person asking question. Which I find counterproductive, as exchange rates vary in times, making answer obsolete within few months. Also it's less useful to other users, who might be using yet another currency.
So should question about prices and trip budgets always be in local currency or at least major currency used in the region?