Why is the BBC trying to flog us high definition televisions?

I keep seeing the new BBC advert showcasing new high definition services in what can only be described as explosive adverts on their channels.

The ads have obviously had a huge amount of cash spent on them - involving large sets being destroyed.

The 'theme' is the Antiques Roadshow being involved in some kind of cataclysmic car crash, with what is presumably a priceless vase being saved by TV news lovely Helen Bruce in Hong Kong action movie style.

Clearly they're taking a recognised BBC signature 'brand' such as the Antiques Roadshow and reimagining it in an exciting 'high definition' way. showing how 'Auntie' is moving with the times.

But why? Who really cares about high def except TV tekkies, and journos who have been set up by Sky TV for free in exchange for numerous plugs (you know who you are).

Is it an improvement? Yes - but it's not like the leap forward from video cassettes to DVD.

Also why is a public service broadcaster effectively running ads aimed at selling expensive TVs to people who already have something which will do the job just as well?

There is also the point that if the same production values and budgets were available to, say, a new science fiction series, we might actually have something worth watching, other than repeats of Dad's Army.

After all the BBC has been cutting jobs left right and centre - often in drama - so those concerned must be delighted at such a large amount of cash being spent on ads like this.