This is where I start to get cynical.
-If I wish for something self-fulfilling such as more work ethic, responsibility, or courage, I'd be thinking of myself as self-beneficial, therefore greedy.
-If I wish for something materialistic like money, cds or video games, then I'm just being an idiot who wants nothing more than momentary pleasure, which is really greedy
-If I wish for something like ETERNAL PEACE or INFINITE ____________ then something BAD is gonna go wrong somewhere, leading to the world being fucked
-If I wish something for someone else, then it would still be for my own purpose because while they'll get pleasure from the wish, it would become a way of trying to feel good about yourself.
Tl;dr, no matter what wish you make, it's shit. So I wish for no wishes ever for anyone. Ever again.