Marketing only really works if the product is actually available.

Exactly.. right now Karma is selling far beyond prediction (as are most other Rio players) and a lot of companies are fighting to buy up things like flash memory and hard drives. While we have more demand than manufacturing capacity it would be a big own goal to increase marketing activities.

Of course huge effort is going into increasing the quantity of product we can manufacture (which is already a not insubstantial figure - only Apple sell more MP3 players than Rio).

Rob