The forecast that is currently available in Nexta doesn't always "cut" the decided use-case of being able to tell "how much will I get for my money".
Nexta should focus on creating a forecast that can tell the user two things:
Is my audience OK?
How many results will I potentially get for the budget in my selected period. (results being either: Clicks, Imp. Unique imp. Reach, Leads, Conversions)