Why on earth would you want to develop Mac software without buying a Mac? This argument really does make no sense at all. It’s like complaining that if you want to drive Porsche, you have to buy a Porsche from Porsche. Er, yeah. That’s how that works.
Please quibble about renting and dealerships or something. Please. I dare you. I double dare you! I swear I won’t stop laughing for a week.
It would be more like a mechanic being required to buy his tools from Porsche to be able to work on a Porsche.
And it's good you bring this up, this too is a problem in the auto industry world. Car manufacturers are pulling these stunts and creating locks for their cars so only approved tools can be used with it.
To continue the analogy, it would be like buying an Epson printer and being force to use Epson ink. Or buying a house and being forced to buy your DIY suppliers from the real estate agent.
We can keep going with analogies all day.
With Apple I have to buy the PC from Apple at it's marked up price since no competition. So it is a fair point.