Nope, doesn't work that way. You can't be both an opinion blog and a journalist. While DF probably does have insider sources most do not, he doesn't have journalistic integrity and can't ask his readers to take his word on something being true that confirms his own bias.
Can you provide any examples of Gruber blatantly lying or misrepresenting his sources? (Serious question)
Likewise, Gruber is just an Apple pundit and spinmeister. Useful when you want to find out what's going on at Apple, or get the day's talking points, but useless for everything else.
Regarding inside sources, are there any examples of him breaking an exclusive story of substance? For example, what is happening to the (new) Mac Pro?
[1] http://daringfireball.net/2012/09/timing_of_apples_map_switc...
It's not just that, it's also the fact that if he receives information that goes against his bias, we don't really have any reason to trust that he would disclose that as well, given his well-documented bias.