Frohickey said:Lets see...
Because it was slow.
Because it was expensive.
Because it sucked, and lost money.
i'll give you two of four. but spec-wise, it was competitive at the time it was released, so it's unfair to call it slow; the two PowerMac models at the time ran at 400MHz and 450MHz, just like the cube.
and "sucked" just does not apply -- it had its pros and cons, like any other model. Apple wanted people to compare it to the high-end PowerMac, which was $700 more than the cube when the cube was announced. but most people priced it against the mid-level PowerMacs, which sold for $300 less than the cube. essentially, Apple guessed wrong on that one and priced themselves out of their own market.
and according to cubeowner.com, Apple sold 148,000 cubes during its lifetime. which, apparently, wasn't enough to keep it afloat at nearly $1,800 a pop.