AFAIK, malarone is not the treatment upon contraction of malaria (I got ~600 mosquito bites in the Amazon thinking that it did and thus didn't bother covering up, haha) but I think it helps in the beginning?
I'm not sure, really - this is why you pay a professional to advise you rather than a bunch of nerds
Or you could look at it this way - roll the dice! But as I get older and have more people (Well, it's been my girlfriend for the past ~5 years) to care about the more I realise I don't want to say goodbye so it's perhaps worth it to be safe and not be as cool.
Your chances are pretty slim, though...