Apple did always took jailbroken iPhones into their support - without making a big PR thing out of it. And - since today they are even "forced" to - have a look: http://www.macrumors.com/2010/07/26/...-jailbreaking/
From my point of view - the comparsion between a claimed as "closed infra and be happy" versus "we are open source" doesn't fit anyway...