urm, because I wanted it?...
er...because my bank account said yes?...
mmmm...maybe its because I wanted a phone I can do most things, Twitter, Internet at work - we have really bad network fun police over what you can look at on the internet at work - including blocking of this forum!, IM with my b/f who lives in the US, email everywhere (this is important to me), calendar syncing on the go, no need to carry a laptop everywhere, I am sure there are yet more reasons
besides, I will take an Android powered phone over some 'dumbphone' anyday
viva la penguin!