Looks like you’re comparing an eBay listing (“or best offer”) of a used copy with the MSRP on the digital storefront where no sale is going on.

If you bought the physical copy at launch, you’d pay MSRP; pretty much the exact same price as the digital copy. Conversely, digital copies often see deep discounts, so you’d probably eventually see the price drop this low on the PS Store.

You’d have illustrated your point better by pointing out that digital and physical MSRP are often the same. I agree that cutting out the middle man did very little, but also, in both realms, there’s plenty of opportunity for deep discount, be it with used games or inventory liquidation in the physical, or bundles and seasonal sales in the digital.