In a general term,

Price = Scarcity X Value

Scarcity = Demand/Competitors
Value = Sum of (Individual Value)

So,
Price = Sum of (Individual Value X DGTTV) / Competitors
*DGTTV = Demands Generated Through This Value

Profit = Price - Cost
Cost = Sum of (Individual cost used to generate each value)

Thus,
Profit = Sum of (Individual Value X DGTTV) / Competitors - Sum of (Individual cost used to generate each value)

OK. CRAP. =P

My point is that there're quite a lot of variables to play in this game.

The key is to:

Using the lowest possible cost to generate a new value that will effectively create a high demand.

That's how the devices start with "i" own our wallets, isn't it?