For the most part the games I download as part of my PSN+ membership are games I would not have bought at retail or games I would only buy used once they were less than $20. So nobody is missing any money from me except maybe the makers of Dragon's Dogma: Dark Arisen because I was planning to buy that at some point.
That being said I think it balances out when you consider all the things I've bought on sale from PSN.
The bottom line is: I don't think a developer who makes a game like Bioshock Infinite with a retail price of 60 bucks has any interest in making a mobile game that sells for 99 cents that someone plays for 5 minutes and then gets bored with.
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