Here's the way I see it, (sorry for the late response, RL got in the way)
If I subscribe what do I get? Best I can tell, the Hearty handshake and a nice warm fuzzy feeling that I kept GRR and it's pod-casters going. But, if there is a store, where perhaps I could buy stickers/decals/logos from some of my favorite pod-casts, then I could not only support my 'casters but advertise as well.
If I subscribe, I'm gonna want something more...sorry just the way I feel. I want video, say from pro-arms, Additional "Exclusive" material that ...pardon the term, "Regular" listeners don't get. But a store could have material from not only the pod-casters, but from fans as well. I could see forum and show based contests for best design with the winner getting their stuff made for sale by the shows they support.
And personally, I'd love to put the GGR's logo on the back of my Van in a nice semi-clear decal with my Fav pod-casts on each side. So everyone behind me would know what I support, and where they could find it.It would go under my TSP sticker