Two things. First, it's a question of choice - do I get to choose between an ad-supported device and a nonsubsidized one ? Second, it would be a bit of a cheat to the developers, as it was unclear upfront what the business model is. If I invest my time and enthusiasm in an Open platform, I want to be told - okay, you can develop stuff that makes us great, but in the end we'll slap an advert on top of it and make a buck off of it without you making a penny (it would be like google inserting an ad on top a web page you found on google but not paying to the owner of the site). If I agree for fame and publicity, cool, if I don't, I can always do something else in my spare time.