this conversation is such a headache.
I know this is a side step here but lets compare this to a different industry.
In the medical field, if a company manufactures and succesfully patents a new drug they sell these at a huge profit. once the patent lapse's you see all the generics come out at fractions of the cost.
The reason - what incentive would the company have to research and license the drug, and design and purchase the required machinery? it costs hundreds of thousands of dollars to register and research these drugs and the company will want to recoup as much of the cost and make it worth there while, whilst they still have the patent.
Same principle on some level applies here:
Apple, and Promise are taking advantage of being early adopters and are trying to recoup the money they spent adopting Thunderbolt while they can. Things will get cheaper, Why? because Apple, Intel and Promise did all the hard yards and spent all the cash ironing out the product ready for consumers to use, and third parties will reap the benefits without bearing any of the cost
Why would any manufacturer go out and create new things and adopt new technologies if there was no money in it? Apple is a business. Business's rely on turning a profit to be successful, which in turn leads to the development of new and exciting technologies.
Everyone is right, in the not so distant future Thunderbolt will be a lot cheaper when these third parties come in. Yes apple are charging a premium but if cost is so important to you then you aren't the type of consumer that should be adopting these new technologies straight off the mark.