Add up your costs, then multiply by negative one. That's your revenue estimate.
Until you have sales or presales data you cannot possibly extrapolate revenue. There's nothing to extrapolate.

Thats wrong. the revenue estimate should be: (pricePerCopy-appstorecut) * 0
the cost estimate is simply: sum(costs)
The profit estimate would then be: ((pricePerCopy-appstorecut) * 0) - sum(costs)

You got me there. My eyes read "revenue" but my brain heard "profit." Thanks for keepin' it real!