Why are so many cricket players left handed?

Wasim Akram, Saeed Anwar, Allan Border, Stephen Fleming, Matthew Hayden, Sanath Jayasuriya, Kumar Sangakkara, Garfield Sobers, Daniel Vettori, Chaminda Vaas, Brian Lara, Graeme Smith, plus I am sure many more are left handed. I am sure that at the top level of the game there is much more than the national average of 8-15% left handedness. Plus even more at the very top of the game are left handed! (Even though Tendulkar bats right handed he writes left handed). I know that people say that left handers are awkward and different and so get further in sport. But I don't think it can just be this. Why do you think it is?