In no particular order:
1. Network World seems to think the total cost of ownership of Macs is about half that of Windows.
http://www.networkworld.com/best/2006/022706bestbreaker-schwartau.html?page=1
2. We have a Windows PC in our office. It's a Dell. After shuffling Macs around for years, I put my back out with the Dell. You know that comedy lifting where you give someone something that *looks* very solid, so they over-lift and hit themselves in the face with it and topple over? Great gag.
3. We all know the iPod has a limited life span.
4. I must have the software, but not necessarily the hardware. But I do need really good hardware, so I'm not sure who else is going to make it. It needs to work flawlessly. Apple is getting there.
5. I chucked all our consumer electronics in the living room and replaced them with a Mac. Now all we need is a better Bluetooth phone remote. I don't think a phone should crash more than a computer. As a result, the wireless keyboard and mouse are slowly replacing the phone.
Five Reasons Why There Will Be No Macs in 2010