Most of that dollar figure was for work, and most of those machines cost over $3000. A lot were maxed-out Xserves, which are [were] much more expensive.
Indeed -- Apple's pro machines were really expensive pre-1998 -- I remember in particular that the Quadra 950 [maxed out with 256mb memory! a rendering monster in like 1992] retailed at around ~$4500ish
