I would argue a $2500 computer made it all the easier for Nintendo (and the Japanese game makers) to swoop in and dominate with the NES at 1/10th the price, at least as a games machine (this is also taking the cheaper Atari and Commodore computers of the time into account). Also worth noting...That particular computer you linked was discontinued in a year and a half (hmm, right around the time that the NES launched...). And last I checked, Apple struggled through a good portion of the 80's/90's (until the return of Steve Jobs).
"If you're whining that you can't afford a high-end gaming machine then perhaps you need to reexamine what is important in your life. "
Ugh, dude...really? I think you totally missed the point here. "Not being able to afford" is not the same as being critical of pricing or refusing to buy something at a particular price point (especially something that may very well be obsolete in 2 years). Look at how much momentum Sony lost when they launched the PS3 at $600. People were more than happy to flock to Microsoft and Nintendo (and ironically, PC's, as the price of gaming PC's was starting to drop like a rock around this time). Sony recovered after awhile, but it was hardly the PS2 era all over again.
At $300, the Rift is something people might take a flyer on and hope it works out. At $600, it's a much larger investment and the expectations are higher. I might be able to overlook a nagging flaw here or there at $300, but at $600, I would expect a LOT more.