I think there must be a language difference between us, since I usually interpret "for the lulz" as meaning "without a [good] reason." Kudos to you for doing well on it.
The oddest reason I've ever heard for taking a standardized test was from a fellow who was an SAT tutor. He would take the test in order to covertly write down good math questions onto his calculator while the instructors weren't looking. He made a point of telling me that when you do this, you have to make sure you answer most questions incorrectly. He knew other tutors who took the tests, got perfect scores, and then were told they couldn't take it again. There was almost pride in his voice when he said to me (paraphrased), "If CollegeBoard sees a 30-year-old man acing the SAT, they're going to look at him funny if he tries to take it again. If they see a 30-year-old man bombing the SAT repeatedly, they're just going to think he's stupid."
Doing this is of course morally dubious, to put it nicely. But I still am amused by the whole thing. There's a degree of "sticking it to the man" both in pilfering question examples from CollegeBoard and lowering the curve by an infinitesimally small amount when he takes the exams.