Tell me why studios won't allow the sell of demo discs...

What kind of demo disc are you talking about?

A demo for a video game is one thing... letting you play some of the game to get a taste and hopefully make you want to buy it.

But who is going to spend much money on buying part of a movie only to have to pay more to buy the whole thing?

If a movie can be bought for $15 for the whole thing... how low would a demo have to be?

Not sure I'm seeing the point here.

When you Google BD Demo Disc - the searches primarily deal with the question; "what is a good movie to demo BD?"

This is one of the few BD Demo Discs produced:

DTS Blu-Ray Demo Disc 2006

http://www.blu-ray.com/movies/DTS-Bl...Blu-ray/36726/

IMO - not enough of a market to make it a profitable venture. Hollywood studios are in the business to make money and niche products don't.

Thankfully, there are volunteers that have assembled great demo discs to fill the niche:

http://www.avsforum.com/avs-vb/showthread.php?t=1391873

And there is also demo world:

http://www.demo-world.eu/

It's a control thing, and for good reason IMO. Take Disney for example. They are extremely careful about their public image. Suppose somebody takes clips from one of their movies and put it on a demo disk along with porn material? Not a good image at all.

The content is the studios property unless sold to some other entity. They have every right to protect it.

And "sold" means the copyright is sold. That's not the same thing as buying a DVD. You don't buy the copyright when you buy a DVD.

As for the various forum groups that distribute these home made demo disks, it's just not enough of an issue for the studios to get involved. Just stay below the radar and you will be fine.

I would use the THX Amazing Life trailer at the beginning of the Indiana Jones And The Kingdom Of The Crystal Skull movie on Blu-ray. Just be aware that you need to play at reduced volume to see if your sub is up for the task before going full tilt.

The whole motorcycle sequence in Tron Legacy is demo worthy of both picture and sound!!

Ah the old days selling home theater at Ultimate Electronics using those early DTS demo discs. Those were the days.

So, if i"m understanding the OP correctly. What you are saying is , there are demo discs used to show off TVs, movies, etc, etc. Why are these not sold to the general public?

(And to be clear, you are not asking "why can't we make demo discs and sell them") right?

I think the reason they don't sell demo discs is because of legal issues... For example, let's say there's a demo containing an avatar 3D clip (which there is), and they decide to sell it to the general public. Now let's say that one of the actors on the movie complains that there is revenue being made off a product not discussed in the contract.. <-- not saying this is what will happen, but I'm sure there's a lot of legal issues like this.

Of course, there is the "fair use" law. But is it fair use if the item sells primarily because of a 2 minute demo? I'm not a lawyer so I don't know. i know that they'd rather either give them away with TVs, etc, or just tell the stores not to give them away... eventually they fall in the hands of employees, and other people.. but in the end, to sell them would probably require going through more red tape than it's worth......

Demo world is mostly useless. I guess if you want to read about demo discs it's great. But you can't buy any demo discs from there so what's the point?