Okay, I've found a number of peer-reviewed studies published by the ACM, but ironically they're not freely-available, and I no longer have an ACM membership. I also found a freely-available economics paper which looks at IP growth vs. piracy rate in developing countries and it found a negative correlation between the two, but that doesn't quite answer the question in any reasonable capacity (all it really says is that economically-screwed-up countries have a high rate of piracy, which is already pretty much a given), and all of the papers I can find seem to only discuss the piracy of "infrastructure" software like Windows rather than creative software like Photoshop.
I recall there being various news articles lately about heads of state in various developing nations thanking Microsoft for making Windows XP so easy to pirate because it's actually made their IT industry possible since it allowed curious kids to learn about computers (which is a backhanded accolade if I ever heard of one), but I'm drawing a blank on it right now.
The best thing I can find to an unbiased report of real piracy impacts are things saying that the true loss (to the publishers) isn't as great as the BSA makes it out to be. I can't seem to find anything linking an increased piracy rate specifically to the creative value of a nation.
But I can fall back on <a href="http://www.reallifecomics.com/archive/0 ... ecdotes</a
>, at least. (I know, the plural of "anecdote" isn't "data" but dang if it isn't powerful.)