I haven't seen anyone talk about an obvious reason for the "cheap" OS upgrade: mandated platform change. Snow Leopard won't run on PowerPC. Apple still has a bunch of G4s and G5s out there; they probably don't know exactly how many. The "low price" of the OS takes a little sting out of the forced hardware upgrade. Whatever Apple "loses" on software, they more than make up for in hardware.
It's All About the Apple Ecosystem [View article]