How do you work out that we have lost a lot of users?
You say that the AirNav Network cost is too expensive, but people will still spend money on alcohol, cigarettes, sweets, newspapers, coffee, mobile phones etc - have you ever added up how much these cost over a year! If I buy 2 cups of coffee from Starbucks in a month, then already I've spent more than the cost of my Network subscription :-)
I get much more enjoyment from my RB than I do from 2 cups of coffee - looks like the coffee may have to stop!