You know......desktop CPU prices haven't changed much at all and haven't kept up with inflation in the past 20 years? In 1996 a flagship CPU could easily cost 800$+. Although in the past you could get OEM or retail boxed CPUs with the OEM having a slight discount. I don't remember OEM CPUs (CPUs in a plain cardboard box, no markings, no stock fan, etc) being sold for a long time. Back in the day if you could go without a stock fan, going OEM could save you a few bucks. No such luck now, everything is retail boxed,.
Anyway. Prices haven't really budged much on the CPU end. In the late 90s a Celeron 300a was around 200 bucks. Drawing a parallel here, the i5's are around 200 bucks. Not much different. The pentium P55C CPUs sold for 700-800$ at launch in the mid 90s. 20 years ago. Nowadays flagship CPUs haven't changed all that much in price when considering inflation. Certainly haven't kept pace with inflation on everything else. Back in the early days, you could pay nearly a grand for bragging rights CPUs. The same applies today.
If anything, you should apply this question to other components. Although I will say. The only MAJOR thing that has changed is branding with motherboards......around the year 2000 you didn't really have so much choice with motherboards and so much price variance. Now you have the ROG super duper overclocking motherboards that cost 400$+, it wasn't like that back in the day. Pretty much most companies released 1-2 SKUs for a given chipset and that was basically that. GPU wise, in 1996 or so you could get a Matrox Millenium + 3dfx voodoo for 400$. Now? You get a GTX 780 or R9 video card for 400-500$.
I think CPU prices are fine. Other components? Maybe that's the better angle in seeking desktop value. Although, if you're a smart shopper, you can still get a great deal really. PC build prices haven't changed much IMHO.