To me, as long as u know how to spend ur time wisely, it should be ok to play dotA and create the clan. I started playing dotA since 2003, a few months before i sat for my SPM. At that time, i spent a lot of time on it. Almost everyday i played dotA till 3-4am. But of course, i did spend some time on studying. And at the end, i still got 10As in SPM. Even now i'm in University, i'm still playing.. dotA is just so nice and i love it very much.. haha..

So, spend ur time wisely and good luck in ur future.

all the best.