I think what Cave Man said in an earlier post, that "... many are saying "I think I'll build a hackintosh'", is a true statement. The immediate availability of an upgraded mini is frustrating some people, and quite likely some of those folks are considering building a Hackintosh.
But anyway -- regarding the easiness of building a Hackintosh: Doing so is not all that difficult provided the person has some basic hardware building skills and knowledge about the process, along with the ability to find information on the subject (and filter out the out of date and basically "bad advice") ... or... has a desire to learn the skills and acquire the knowledge and is willing to spend a little time learning about the subject.
As some have pointed out: Hackintoshs can achieve high benchmarks and function very well. But not everyone has the skills/knowledge and many won't be able or willing to acquire them, and thus the pursuit could end up being a frustrating experience. Others type of folks wouldn't even consider doing so. And other folks may have completely different feelings about the subject.
It boils down to a personal choice combined with one's ability/knowledge, etc. And so far at least, Apple hasn't broken down anyone's door to seize their Hackintosh. I seriously doubt Apple would consider taking action against the end user, but Apple's reaction to Psystar's commercial product is an entirely different sort of story -- one that goes far beyond the EULA issue and into the areas of trademark and copyright protection. (But that debate rages on in other threads...)
And so in regards to the mini: I think what some people are basically suggesting is that if Apple would (at least) update the mini that the frustration level would go down a good bit, and some would add that a "headless Mac" (using desktop components) would be an even more welcome solution for many people.