1. To impress people you don't know
2. To be judged by people you don't know more favourably
etc
Personally, I don't respect people here purely because they obtain an impressive study score or mark. (There are plenty of people on this site who have achieved amazing results, and I don't respect all of them, lol

). I don't even take much notice, to be honest. Your study scores do not reflect who you are.
If I really like a person and their contributions to the site, I will be really happy for them if they get a mark they are pleased with. But if someone just signs up, makes a few posts and then randomly writes, "I GOT 50 IN EVERYTHING WOOOOOOOOO!!!!111", I won't really care. I mean, congratulations on their achievements if they did really receive those marks, but I still don't really care. I don't judge them more favourably. If someone posts really friendly and lovely posts, and tries their best to help other individuals, then my respect for that member will increase ten fold.
So from my point of view it's pointless.