Alex, it has to be said that Panasonic and Electrolux did very well too, I am not sure how they veiwed the competiton, but what I do know is that both Panasonic and Electrolux advertised their cleaners on TV a hell of a lot. Hoover didn't promote the Turbomaster anywhere near as much.
Why? Well TV advertising cost a kings ransom and it did seem to me that sales of the Hoover cleaner could easily be made once something had enticed the consumer to the showroom for whatever it was they had seen on TV. Once there they would see the Hoover cleaners too.
Hoover had a very loyal customer base so they could probably afford to be as laid-back about advertising as they seemed to be. But if Electrolux had boasted in their adverts about how easy it was to use the tools, and how it had filtration, that would have left a mark on the mind of the consumer perhaps.
This said, I do have to remind myself that every manufacture of any product has to be able to keep up with demand, so for all I know they may not have wanted any more sales than they had.