Yes, agreed... a podcast produced by Jagex really wouldn't be competition with RSBandBUpdate! It would be totally different. It probably would be an audio version of the BTS, Dev Blog, and the like. I'm sure it wouldn't even be half as "entertaining" as RSBandBUpdate!
Anyway, just a quick scan of the new memberships since that FB post by Jagex:
Membership List wrote:
2 aakanshayadav 50 minutes ago
3 ag99 Today, 6:39 am
4 Aaes Today, 3:55 am
5 axredskins Yesterday, 6:40 pm
6 ak40sheven Yesterday, 5:59 pm
7 Saul Yesterday, 5:42 pm
8 bhines7 Yesterday, 5:14 pm
9 skillerboy Yesterday, 4:50 pm
10 mr scooley Yesterday, 4:37 pm
11 AC131 KILLER Yesterday, 3:54 pm
12 habman4 Yesterday, 3:50 pm
13 tubeblog9ipx Yesterday, 1:49 pm
14 black 0ps Yesterday, 1:11 pm
15 rember light Yesterday, 12:47 pm
Not bad if you ask me. 14 new memberships in less than 24 hours. Some exposure for sure. But, remember if just one person tells 2 friends, and they tell 2 friends, and so on and so on... You just have to light the match, the fire will spread all by itself.
_______
EDIT:
OMG, OMG, OMG!!!! (Read: Oh, My Goodness!!!)
Bingo!!!! Hooked me a JMOD! 
*happy dance*
Look what just happened: