For what it is worth, Gutterfax has it pretty much right about lack of local marketing, in my experience.
I live in TW1 - it was a leaflet through the door announcing Broncos were coming to play at Griffin Park that got me to go see the disaster of their beating St Helens 40odd - 6, after which I continued to watch them as the only game in town.
Since then I've seen nothing else through the letterbox and hardly a sign of local marketing worth the name. I know the owner of the local Sports Shop, have arranged to go watch Broncos at Griffin Park and the Stoop with him, and he's never been approached to put up a poster or anything - and wouldn't a link to a sports shop appear an obvious place to advertise - other local sports clubs do.
As for local free papers carrying ads recently (did I get that right?) they don't come through our door.
At least the Richmond and Twickenham Times carries Broncos reports.