Bear in mind that the article you linked to was written in 2011. Original retail price for 2600 was $189.95, which if you look at
www.usinflationcalculator.com shows that to be $953.28 in 2023 money. I can't recall the source for my original retail price for carts, but working it backwards it would have been around $40. After researching, I've seen it be mostly around $25-$35, which works out to be $150-$175, so still not that far off tbh.
Either way, it makes the average full price of $40-$70 these days seem extremely reasonable ($70 = $14 in 1977 money!), especially when considering what you get in comparison.
However, it's very important to note that the sales of the top selling games far exceed that of the games from the Atari 2600 days, the highest selling 2600 game was Pac Man at 8,095,586 copies, which is still pretty great, but compare Minecraft with 238,000,000, and you can see the difference. Factor in digital distribution vs manufacturing and shipping cartridges and I'd say the profit, even at the present levels is probably equal to or higher per unit today than when the 2600 was released. Which is just as well as I would suggest that the development costs for modern games do not track proportionally to that of the Atari 2600 era when factoring inflation into the overall equation at all.
Honestly, $70 for a game like Zelda; Tears of the Kingdom, or Starfield (if it actually turns out as good as they show) seems very reasonable all things considered. Makes the 1977 $7.97 price for the Odyssey expansion look not so expensive either, and the sale price of 1977 $2.79 a positive bargain. Or have I gone too far with this?