> The short version of this is that there is a lot of money to be made from enterprises by selling them outdated technology because enterprises are almost always slow to adopt new technology.
A end-2011/2012 MBP has more than enough resources to fill most day jobs' needs. Give it an SSD and enough RAM and you can run IDEA just fine as on a brand new one.
The only thing that's not really possible is doing video editing or high-res photo editing because the screen is not high-res enough. Unless you're doing one of these two workloads, no need to shell out the double amount of cash if you don't profit from it. Or attach the MBP to an external screen, that works fine too.
Oh, also if you have >1k MBPs in service already and you don't want your IT service guys to have them sent to Apple for everything (after all, the guys are expensive and you want something to do for them other than packing Macbooks into parcels), the mentioned MBPs offer the advantage that you can do a LOT of the common stuff (hard disk swapping, battery replacement, RAM upgrades) yourself on these machines. When I had to swap the disk on my work MBP (end 2011) I needed under 5 minutes.
Also, enterprises like consistency because it makes spare parts acquisition and user troubleshooting really easy.