They offer the Myers-Briggs to help you focus on "what you want to do", and I guess I'm not atypial of the INTP/INTJ in having a hard time figuring out exactly what's out there for me. Only something like 2-4% of the population is INTP or INTJ, so we're "special", I guess.
I do, however, find it amusing that the "official" test only re-confirms what's turned up on all those various memes (like that recent one that had me as Lord Voldemort)!