A distributing brewery with a tatsing room is a totally different story. You are supplementing your monetary percentage with the tasting room - maybe 5, 10, 15% or more (but doubt too much more). But it is not the primary source of your profit. A brewpub is mostly reliant on people coming to the establishment to consume the product. Totally different scenario. Food is usually a huge deal. Again, not always, but as far as the "model" goes, the primary incentive. Beer needs to be good too to truly be successful.
I'm not talking about gourmet food. Hell, most people think Appleby's is great. I'm just saying you have to have decent food and that as much as we like to think the beer is #1 it is really only a gimmick in most brew pub cases. certainly not saying that is cut and dry, just sayin' that it is the case for a vast majority.