Looking the refurbished offerings (from the Canadian Education Store) it appears that the older systems have the relatively same price as the newer systems. I cite an example here with Mac Pros, but I see the same issue with Mac Book Pros. Look at these offerings as of 20101103.
Refurbished Mac Pro 2.93GHz Quad-Core Intel Xeon
One 2.93GHz Quad-Core Intel Xeon "Nehalem" processor
6GB (3x2GB) of 1066MHz DDR3 ECC memory
1TB Serial ATA 3Gb/s 7200 rpm
Two 18x SuperDrives (DVD±R DL/DVD±RW/CD-RW)
ATI Radeon HD 4870 with 512MB GDDR5 memory
$2,989.00
Refurbished Mac Pro 2.4GHz 8-Core Intel Xeon
Two 2.4GHz Quad-Core Intel Xeon "Westmere" processor
6GB (6 x 1GB) of 1066MHz DDR3 ECC memory
1TB Serial ATA 7200 rpm
18x SuperDrive (DVD±R DL/DVD±RW/CD-RW)
ATI Radeon HD 5770 with 1GB GDDR5 memory
$2,999.00
Refurbished Mac Pro 2.26GHz 8-Core Intel Xeon
Two 2.26GHz Quad-Core Intel Xeon "Nehalem" processors
6GB (6x1GB) of 1066MHz DDR3 ECC memory
640GB Serial ATA 3Gb/s 7200 rpm
18x SuperDrive (DVD±R DL/DVD±RW/CD-RW)
NVIDIA GeForce GT 120 with 512MB GDDR3 memory
$3,099.00
Why would someone buy the "Refurbished Mac Pro 2.26GHz 8-Core Intel Xeon" or the "Refurbished Mac Pro 2.93GHz Quad-Core Intel Xeon", when they could get the "Refurbished Mac Pro 2.4GHz 8-Core Intel Xeon", which seems to be the better deal? Perhaps I do not understand the value of the first and third with respect to the second, because I do not understand the performance that the technology provides. It just seems to me that the second option is the better deal. (Two processors and 1G of video card memory)
Refurbished Mac Pro 2.93GHz Quad-Core Intel Xeon
One 2.93GHz Quad-Core Intel Xeon "Nehalem" processor
6GB (3x2GB) of 1066MHz DDR3 ECC memory
1TB Serial ATA 3Gb/s 7200 rpm
Two 18x SuperDrives (DVD±R DL/DVD±RW/CD-RW)
ATI Radeon HD 4870 with 512MB GDDR5 memory
$2,989.00
Refurbished Mac Pro 2.4GHz 8-Core Intel Xeon
Two 2.4GHz Quad-Core Intel Xeon "Westmere" processor
6GB (6 x 1GB) of 1066MHz DDR3 ECC memory
1TB Serial ATA 7200 rpm
18x SuperDrive (DVD±R DL/DVD±RW/CD-RW)
ATI Radeon HD 5770 with 1GB GDDR5 memory
$2,999.00
Refurbished Mac Pro 2.26GHz 8-Core Intel Xeon
Two 2.26GHz Quad-Core Intel Xeon "Nehalem" processors
6GB (6x1GB) of 1066MHz DDR3 ECC memory
640GB Serial ATA 3Gb/s 7200 rpm
18x SuperDrive (DVD±R DL/DVD±RW/CD-RW)
NVIDIA GeForce GT 120 with 512MB GDDR3 memory
$3,099.00
Why would someone buy the "Refurbished Mac Pro 2.26GHz 8-Core Intel Xeon" or the "Refurbished Mac Pro 2.93GHz Quad-Core Intel Xeon", when they could get the "Refurbished Mac Pro 2.4GHz 8-Core Intel Xeon", which seems to be the better deal? Perhaps I do not understand the value of the first and third with respect to the second, because I do not understand the performance that the technology provides. It just seems to me that the second option is the better deal. (Two processors and 1G of video card memory)