Absolutely, it's called a vendor supporting theiring product. Why would you as a software developer want to work with advanced functionality (only available by one of the two vendors) when they won't give you the time of day with regards to support?
You can't really excuse AMD/ATI for "not being big enough" or not being in a financial position to provide partner support for their products. This is a basic part of being a technology vendor and they have failed miserably in both incarnations of the company.
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