I took that OPs exam - I studied for about 10 - 12 hours a day (incl. Ground School) I focused a lot on OPs and walked out knowing I had passed. However, seeing questions like that made me feel positively cheated.
Yes there is a case suggesting that it's a waste of effort, this is an example of that. But ask yourself this:
Walking out of an exam that you know you need to pass, how will you feel knowing that you aimed for 100% and might possibly get there or there abouts (and at very least passed)?; compared to that wonderful "I need booze to get me through this" emptiness that you get when you realise that studying for just a pass might not have been enough and the next 10 days are going to be spent awake at 3am nursing the bruise left after hours of kicking yourself?
What is the point of selling/remortgaging your house, begging, borrowing (stealing?!) a huge (HUGE!) amount of money to do something half heartedly.