What's drawn them, by and large, to Apple equipment is because they know it's easy to use and comfortable for them. They're just regular consumers who know they need Wi-Fi in their home. Most people buying these devices aren't IT people. Hell, I worked in IT, and I find setting these things up intimidating.
Setting up a Wi-Fi router can be tremendously intimidating to the layperson. They present you with page after page of configuration information, myriad checkboxes and radio buttons that are either not well-described or not described at all, clad in techno jargon. They require you to use web-based interfaces.
That's because, put frankly, most Wi-Fi router manufacturers absolutely suck at making their devices easy to set up and use. And that goes a long way to effectively targeting Apple's customer. Apple makes its network devices as easy to use as the Mac and the iPhone. There's a lot more to recommend Apple's devices than simply 'brand loyalty,' as Raja dismisses.