"This should be legal coz without it u can't get ur killz wen towers r ded"
Well, that's tough then, isn't it? You aren't entitled to achieving any sort of pk goal, you have to earn it. That's the whole point. This may seem insignificant, but the extra kills you earn from bush pking that you wouldn't have earned otherwise when towers are slow every day add up. Regardless of your ratio of tower pking vs. bush pking, it's still a cheap method of earning kills.