There are moon bases on the dark side of the Moon!
Well, not really. But the dark side of the moon-- is unknown to us. We look at the moon almost every night but we never see the dark side of the moon. The same is true with the world of audiences and niches.
Why do some pages blink into place like they have a hyperdrive installed; and others dawdle their way into existence? The former likely have some simple tricks figured out. Those tricks are actually easy to figure out and the benefits are broad. They improve the user experience and they make search engine optimization easier. A couple of these tips may be a little more server intensive (like Keep-Alive), but some of them can actually make your site easier to deliver.
Why are Google and Amazon rich? They've had me on their payroll. I have been working for them for a decade. I signed up for Amazon Associates over a decade and Google AdSense almost a decade ago.