I started out with a Rev B iMac, fell madly in love, then went for a PB so that I could continue to have OS X with me wherever I go (gotta love mobility!), then one day decided to start playing around in iTunes.... Yep, next thing you know I was buying an iPod. So for me the "halo effect" was in reverse from the usual where people start out with an iPod and then decide to check out the rest of Apple's goodies.
And, oh, yes, when I started accessorizing yeah, Apple and a lot of other vendors have been very happy that I discovered the Mac and Apple products!
OTB