To me, something also worth noting is that prior to the Duck Dynasty show, none of the people behind the company had their well known "bearded outdoorsman" looks. There's a widely circulated photo where they look like your average upper middle class suburbanite.
The point on the Democrats celebrity endorsement is true, but I'd argue that the GOP celebrities, including the Duck Dynasty people, are of the same vein and aren't the rural everyman they portray on the show.
I would actually argue that the opposite is true - that their previous personas were an act put on to meet social norms. They are certainly something of a caricature of themselves today, but is likely a lot closer to how they see themselves.