To each his own.....
FYI:
DM's Home Mac G4 (running ~ 3hrs/day for over 2 years with cable modem)
Number of Virus infections: 0
Number of Spyware infections: 0
Number of browser hijacks: 0
Number of Worms or trojans: 0
Number of kernal panics (equivalent to PC "Blue Screen"): 0
Number of hours spent worrying about or configuring to combat virus/net attacks: ~ 0.04