problem is that crippleware was, and still is, universally hated.
The only areas where it succeeds is where there is no other real competition.
Most cripple-ware wouldn't give you a fully-functioning product: save didn't work, print had "UNREGISTERED" (or worse) emblazoned over it.
Having a great, polished level for free and the opportunity of buying more isn't my idea of crippleware. There is no feeling of being cheated and no "if only".