They could charge $1000 per developer for the kind of service they are providing. But they charge $100 for an entire company. But that would mean we won't have this app market and start up ecosystem that defines modern economy.
Your second sentence (in bold) is all conjecture and hypothesizing
You're also completely ignoring how much 3rd party Apps DRIVE iPhone sales
No 3rd party Apps? .... I got news for ya ... iPhone becomes a nothing burger