Jose, you actually need to go back to the general specifications of entry-level film SLR cameras, where the Canon Digital Rebel feature set is standard for entry-level models. (In fact, it is above standard thanks to its higher max shutter speed and x-sync.) In that market of multiple models from all makes, the free market is alive and well. And this metering selection is found on all entry-level models. Now, we simply see the same feature set being applied to an entry-level digital SLR. If any manufacturer wishes to offer an EOS 30/Elan 7 featur set at an EOS 300V/Rebel Ti price, they are certainly free to do so, thus gaining a competitive advantage in the free market. Likewise, if someone wants to offer a 10D featureset at a 300D price, they are certainly free to do that as well. But the point is, from a business perspective there is justification for any manufacturer to differentiate between their models by withholding certain features. And Canon is certainly not the only one doing it. But Canon is the only one offering consumers the choice of a sub-$1000 DSLR.
Actually, from an economics perspective, you're making a technical
mistake.
The sort of behaviour you're describing is not typical of a free
market, but rather of an oligopoly.
In a free market (where anyone would be able to enter the market
without caring for patents, and other entrance costs), another
company would imediately release a camera without the cripples, and
they would outsell Canon out of the market, because they could add
value to the camera without adding to the cost.
So, in a free market, the consequence is that you always get the
best possible product your money can buy, and the only limiting
factor is production cost.
In a free market, Canon would never get away with artificially
crippling a camera.
Since they have a monopoly of the 300D and, together with a few
other brands, they have an oligopoly of digital cameras, they can
do this and get away with it.
I can accept these are the rules of the game. But please, don't
call this a free market, which it isn't.