It certainly is a valid point. However, your assumption seems to be that the biggest barrier to entry would be hardware? If so, I disagree, with all due respect. I spent best parts of the summer learning iOS - it's not extremely hard, but it has many non-obvious corner cases that you'll need to spend some time to discover. So with almost any reasonable hourly rate (even at the minimal wage) I've invested much, much more in the learning of the framework that I would spend on a minimal hardware that will allow me to develop for iOS.

Let's face it - if you're serious about porting your apps to iOS, you would buy a mac at some point.