I think it's the appeal of the setting itself, which is thus far very promising; coupled with similar if premature praise to yourself as a narrator. This is something I'd like to get knee deep in the guts of and poke around. With nation RPs I feel things become too isolated, segregating players in their own corner of the fiction until events force interaction. And interaction, I feel, is a paramount component of collaborative writing. A thread just reads better if it has just that, a thread of commonality between each post (A replying to B, immediate reactable material to compel the reader to invest rather than skim.)

But I digress.

You've a good idea and I wish you nothing but success for it. To that end I might suggest that interest may be easier to drum up in the Nation RP forum.