Movies have been around way longer than games have. Even though money was more valuable in the past it went from like you say 25 cents to what it is today which is like $3 if it's some kind of cheap night to $15 for a ticket. If you inculde to snacks then yeah around $40. So over time it was a steady increase. Super Mario Bros 3 I see was around 60-80 dollars when it came out which today is like twice that from what some sites are saying. By those factors game are actually getting slightly cheaper over time especially since you can buy some games for $15 and still get tons of playtime out of them. Movies are slowly increasing while games decrease from what trends say. So I'm not trying to defend or attack the Taken King DLC but those two mediums have totally different trends. Music I'd say would be closer to movies by going up slowly because they still aren't all that expensive they've remained pretty stagnant for the most part.