Yeah, no shit, handpick a specific digital game that just released vs. any older physical game on sale and you get those prices. You could do the same thing the other way around, would be a lot easier since digital games go on sales quite often on most platforms and generally have far lower prices than not-used physical games.
I didn't pick a specific game. That's the default price of all new releases. Full priced games start at £45 in a shop or £60 on PSN etc. That's been the case for pretty much the whole generation.