Why are there so many Mac users?

I am gradually thinking of going the all-digital route, and to that effect I've started reading a lot of threads about all-digital systems.
One thing I noticed is that many audiophiles with such systems are using either a Mac Mini, iMac or other Mac products.
Are there any major reasons for doing so? What advantages do Macs have over PCs (aside from looks)?
I am trying to soak in all the information I can gather on the subject, so thanks for enlightening me!

Patrick