The price of AAA games has gone down in real dollars, so adjusting for inflation isn't accurate. Also, when you paid $40 for a game in 1998, you ended up with a game you could resell when you were done with it. The video game market was built around that expectation. And the price of used games was much lower than retail -- $5-10 was common for games that sold at $40 a year or two earlier.

In this case, I think it's notable that the mobile Dungeon Keeper is both less playable and more expensive than its predecessor.