Whether Gray Matter sold bad or not is not really the main concern - no one expected it to be next Call of Duty or something - because genre is not that popular. If you're doing adventure game you're prepared not to hit big numbers but in best scenario you hope to sell well.
Obviously, there IS adventure game market or we wouldn't had seen any adventure game in last 10 years. It's just that particular market is enough to do business, and not to make groundbreaking sales.
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