Copyright 1999 PC users often think that once they bought the machine then that is it. Then the first thing they are hit with when buying a new PC is the installation costs. It is obvious, to those that use both, that Macs are easier to install.
Installation time is money.
PC users forget to factor in time and aggravation when they compare prices. This is what USB for the PC is a copy of. So Macs install faster, and require fewer installs, either initially to get it to what you want, or later on. When you do install something on the Mac - Software or Hardware, the process is often much shorter than PC's. For example - I put in a new video card on a Mac.