Usually it's not so much the 'scraps' left behind by Apple as the groups that either dislike Apple, or have such a hardon for open-source software and standards that they won't succumb to it.
For instance, whenever asking someone why they have X brand audio device instead of Apple, the answer is "Apple is too expensive", "it doesn't play OGG", "Apple sucks".. Sure, Apple likes to maintain tight control on everything they sell. Sure, Apple likes profits, but who doesn't these days?
Once Apple realises that they can make even more money and have greater market share by reducing prices (maybe drop the price of every computer by $1000, and every audio device/phone by $200), then their marketing will be that much more effective. The problem with Apple vs. Microsoft is justifying spending $2000 on an OS. That's all you're doing. Any Apple machine can be found in Microsoft land with similar specs for 1/4th the cost.