This is part of why I bought an HP Touchpad when it wasn't on the fire sale, and a Palm Pre+ before that. The Palm folks (even at HP now) not only don't care that you're hacking their device, they actually actively encourage it. They've gone out of their way to provide an "oh shit" button for when you've completely frazzled the bootloader and nothing else works. The Touchpad runs webOS, Android, and Ubuntu, and HP/Palm doesn't give a shit.
Now that their OS is open source, too, I'd love to see the rise of HP/Palm in the hacker community. They're not just accepting of hackers, they actively encourage it in all aspects.
No, not really. There's still a long way to go.
And Microsoft's revenue sharing model vs Apple's doesn't have much to do with that.