Apple has created enormous buzz from the past 4 years, it has released a number products and almost all have been successful, best thing is that most of Apple’s products are promoted online giving opportunities for bloggers to profit from that. Many Iphone blogs were started in 2006 when there were some rumors of the super cool phone. During that time these blogs got millions of visitors every month and their was no end to their popularity till today. The Ipad has created enormous buzz even before its release, this shows the demand for Apple products and the advantages you’ll have with it. Read more here
Apple definitely isn't a niche though, it's an ultra broad category with a TON of competitors in search engines.
I think you made a good point. It's easy to say that a market is saturated, but if you're creative enough and put forth the effort you can really stand out and make money. Think Richard Branson...