Band of Horses and the sponsorship dilemma

We’re so used to bands doing ads or having their songs used as product placement or having corporations sponsor tours that any news of this sort doesn’t raise eyebrows now. You just hope that your favorite band doesn’t get associated with anything too embarrassing. And then there’s the case of Band of Horses and the backlash and their response. So is BOH right to say that they’re just trying to earn a living and keep playing music or are there some lines that shouldn’t be crossed in taking ad money?