Is a concept of machiavellianism useful?
What I'm going to say here pertains mostly to your previous question on this topic, rather than this one, which does strike me as a bit of knee-jerk reaction, however, it might help with this one as well.

Mach-IV has, by design, four main factors but in opposite pairs, so only two main sub-scales, which are added for the total score


negative (vs. positive) interpersonal tactics
cynical (vs. positive) view of human nature


You can actually look up how the individual questions load into these factors, for instance Table 2 in this paper, the full text of which is freely available. It is possible to score high on one but not the other sub-scale. There are also to two odd questions about Morality in the Mach-IV, but this is a rather poorly designed part of the test. Mach-IV has an overall degree of internal consistency (Cronbach's alpha) of 0.7 (mentioned in that paper), which is borderline acceptable.

There is a newer Machiavellianism test that has seen some adoption, called Machiavellian Personality Scale--MPS (2009) which you might be able to find/take; the authors have made it freely available. MPS has more independent scales:


Distrust of Others (five items)
Desire for Status (three items),
Desire for Control (three items)
Amorality (five items).


As for usefulness, I don't know of real-world uses of Mach-IV outside of research. It's not like you won't land a job at Best Buy by failing it; actually machiavelianism might help you score such a job, but I'm digressing too mcuh already.