The logic being there is finally an OS out there that I will run X applications natively that also has real productivity apps (Office/Quicken/etc).
Before I moved to OS X, I had to have multiple computers around to do what I needed, now, I have one. There is a very large number of die hard UNIX folks moving to OS X for the exact same reason, we're sick of having to have our beloved unix box with our beloved X apps, and having to have yet another box taking up space to run the apps that don't exist on our unix boxes (office/quicken/quicktime/etc). Now, I have the best of both worlds, and I'm no longer feel like i have my hands tied due to the OS I'm currently in.
Brian