First, thanks to all who responded to my blog post!
As far as intrinsic motivation goes, I did think about this, but in the end I declined to comment on generalizing about the motivations of a group of people. I chose to stay with non-motivational factors in my discussion because those could be analyzed more objectively. I did not feel right saying that one group of individuals thinks this way more than any other group, and certainly without a serious survey to really see what people want to do.
I do believe, like many other disciplines, that designers haven't been exposed to, or even given the opportunity to enter the investor business until recent years. Now that the discipline has been exposed to a new potential career path, I think we'll see that perhaps peoples' motivations could change simply because they have the exposure to a new possibility.