With these Kickstarter pens, people are creating good quality barrels for good quality refills. Look up and down this thread and you will see how many people use < 0.5mm pens. You can barely get those type of refills on the store shelf, much less in a high-end pen.
The US pen market is far from saturated. It is bone dry from my perspective.
TL;DR - Just because you buy an expensive pen doesn't mean it writes worth a crap.