Another thing to have in mind, prices on second hand playstation do not drop rapidly. Here where I live, I can buy a ps4 pro, (or ps5) and after a year of playing sell it for pretty much same money or just a little bit less than I paid for, which means if you do that, you have been playing for a year for free, or extremely cheap cost.
And if you think how one economist explained how we should think of cost, and that is per usage, if your are playing several hours per day, so playing a game cost you kinda one cent or even less than so. That is much cheaper than getting a beer or burger or coffee, per "usage".