I'm not really keen on that comparison. Yeah, compared to the movies is a good one, but the other stuff is rather silly. I get the comic's a joke, but still...
Part of why we're in the mindset of "games cost X," is because that is how consoles are. Bad games launch for the same price as outstanding ones, $60 plus tax. There are some exceptions, but not a lot. So, when games people really like, such as Angry Birds, sell for $1, people don't like the thought of spending 5-7 times as much for those apps that cost so much more (proportionately).
Personally, I am not against $3-5 for an app, but $7 is a LOT. When I spend $60 on a game, I play that game for AT LEAST a year. I mean, I've only been playing Halo 4 since mid-November (so about 2 and a half months), and I have more than 120 hours in that. I spent $50 on Skyrim, and I put 150+ hours into that. Spending $5-7 on an app that I will play for a few days, totaling maybe 5-10 hours, is a really crappy deal (again, proportionately). I did get Skulls of the Shogun, because it seems like it will offer more than a couple of hours of fun, and I had Microsoft Store money from Bing Rewards.
I wouldn't have bought the game if it was out of my own pocket because of what I see as the OTHER reason people are hesitant to spend on apps--alternatives. Why spend $5-7 on one apps when there are tens of thousands that are free? They might not be as good as Skulls, but I would rather play Shuffle Party, Gun Bros, Sonic CD, Wordament, Flowerz, and the other loads of games I can get for free than spend $5 on Skulls of the Shogun.