intel has always charged a premium for their premium chipset. Their are hundreds of reports, articles even quotes from motherboard manufacturers to verify this.
here's one.
http://www.anandtech.com/cpuchipsets/showdoc.aspx?i=2635
another
http://www.neoseeker.com/news/7702-intel-reveals-p43-chipset-sets-series-4-chipset-pricing/
another
http://www.theregister.co.uk/2004/06/30/intel_chipset_price_cuts/
My cursory example shows that intel does charge a premium for its newer chipsets, but I was surprised to learn that they are only a small part of the price difference. The combination of "new", features such as included e-sata controllers, raid controllers, firewire, triple and quad 16 / 8X pci-e leads me to believe that the motherboard makers, marketing and intel marketing altogether result in the high priced new tech motherboard prices.
I personally cannot justify $250 to $300 for a motherboard when a P45 with all the features I need and a Q9550 cost hundreds less and comes with performance 10 to 20% of the i7 and is still VERY FAST!
Unless you are running a workstation for video editing, modeling, engineering, science etc., the absolute cutting edge system is simply not the best performance for the dollar.
Even then, you are probably better of with that Q9550 or Phenom II 940 and getting a render farm for the video editing, or sharing a CAD system for heavy crunching with other engineers and then run your own stuff on the main stream hardware.
Hey, I'm just glad we have such powerful machines at such reasonable prices! Can you imagine running an HD Media center PC on a $39 dual core AM2 X2 cpu on integrated 790G video for $80 without AMD? intel would never have gotten there without them. We would be running 4 Ghz PIV's or worse Itanium derivatives that use 300 watts each had AMD not been there to push intel.
Buy the good AMD tech when you can to keep them alive, but just like me, you have to do what's best for your household, business, employer etc. I run both and I'm pleasantly surprised with values from both companies.