There’s only so much entertainment you can get out of one before you’ve seen everything, get bored, and look for another one.
You’re absolutely right, but that’s true from “your perspective”. For you the fame might last 50 hours and that’s all, but the developers still need to work on big patches, content and fixes even years after release.
If a studio fails to budget for that and make sure those costs are included in the price of the game, it frankly deserves to go bust
And this introduces another topic I think. Would the average consumer willing to spend more for a game with everything in it? AAA already cost 70$ at launch, would the average consumer accept further price increases, or would selling plummet in comparison with reduced price+dlc or free to play with microtransanction?
At the end companies are not inherently “evil” they just look for what works and what doesn’t by trial and error