They are turned on ... vBulletin automatically publishes RSS feeds of each forum if I point an RSS reader to :
Straight Razor Place Forums - Buy/Sell/Trade
I can get all the BST threads ... however the update frequency is awful - for example in the feed above the last update appears to have been between 7:25 and 9:26 am GMT+1

I believe they are updated by a cron job on linux machines .... not sure how it is done on windows boxes.

Barney