My explanation:corporations want to benefit from scale. That means lots of computers with identical specs. Not only everyone gets the same machine, they get the same machine for many years. It's not unthinkable for a spec to stay constant for 5 years. In exchange for this stability, the makers of the machines (Dell, HP) can lower the price significantly. As a corporation you can buy a very powerful machine for something that a regular consumer needs to pay about twice the price. But that's when the spec is new. As years pass, a machine with the same spec gets to be downright sluggish.