First, don't get mad at the brewers, get mad at your elected representative for the laws breweries operate under.
Second, you're paying the same, or more, per ounce because of the convenience of drinking it at your leisure, at a place and time of your choosing, and of drinking a non-package product, in some cases. And if you understand those basic economics, and still don't want to pay for the growler fill, then go buy a sixer! I guarantee you the brewer doesn't care if you buy a case of the pale ale or a couple growlers, so long as the beer is moving out the door. But please, whatever you do, don't get a growler fill of something draft only and then, as it's being filled, ***** about how you could get 8 ounces more of bottles for the same price.