> For example Tekken 7. To get every character in the game and all DLC, you have to pay 120 dollar.

That's a $20 increase from the $49.99 price of Tekken 1 on the PS1, released in 1994, once adjusted for inflation. And Tekken 7 allegedly cost 50 million yen, or $370K USD, per stage, which is probably more than the entire budget for Tekken 1, even after adjusting for inflation. If anything, the Tekken example illustrates how the increasing number of sales over the past few decades have subsidized significant increases in development costs.