Eh just think about the guys who spent $4,000 on a 5MB Hard Drive for their Apple II's. I just picked up a 16GB USB 3.0 drive for $10!
Technology moves quickly. The cutting edge is expensive and drops rapidly in price. Some want cutting edge, and there's a cost in that. That means less resale value, since once initial R&D costs are recouped and competition begins building similar machines happens, prices will drop. Of course, that happens all the time. Lots of MacBook Pro generations have been 'shafted' in resale value when the NEXT generation introduced lower prices, which has happened a few times now in Apples lineup. (The first generation MBP's was what, $1999 or $2199 for the base model? Something like that?)
Bottom line, one nice thing about Apple computers is that they actually HAVE resale value. I couldn't get $50 out of my 4 year old Windows laptop, but I could get a few hundred bucks out of a 4 year old MBP. But, in the end, any resale value should be treated as an unexpected blessing, as technology moves it's not likely, in all honesty.
What's REALLY going to upset the early adopters is the price drop. I foresee rMBP models dropping down to cMBP prices in a matter of a couple of years. But, it's the nature of being on the cutting edge. Again, the very first commercially available hard disk drive 'systems' (ones with the controller and everything packaged together) meant for consumers (not the huge IBM concoctions) exceeded 10 grand. Just a few years later, they were included INSIDE (these early ones were large, and external) computer systems, and the entire SYSTEM cost less than that, with MORE storage.
(By the way, I'm referring to 'modern' HDD's, technically Hard Disk Drives have been around since the late 50's)