Why does Whatsapp cost on iOs?

So, I'm getting a iPhone 4S, but I was wondering why Whatsapp costs? £0.69 I think it is. Was just wondering because my other friends all use Android, and have it free, except one friend who has a 3Gs and got it free because she downloaded it ages ago.

There are many apps that cost on iOS that are free on Android
the reason is that 1st, there's more people that will pay for it on iOS, and also it costs people and companies my by apple to get their apps in the market, so they would be loosing money giving it away

unlike android, which you can get the development kit free of charge from Google and make any apps free of charge.

It costs 69p but if one of your friends or family have it sign into their apple id on your iphone, go to purchased and download it to your phone for free.

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