There's plenty of jrpgs half that price point with twice the length though. Heck, even the previous GTAs have at least that length for a cheaper price, and are occasionally even cheaper now. Be patient and you'll likely even get the game given away for free.
I'm trying to point out that i don't think that the length of a game shouldn't really be indicative of the price. I have no issue with him enjoying the game or buying it.
He was saying that £80 was worth it cause of the amount of hours. So i brought up games with similar or more hours that are cheaper. Including prior gta games...
I'm lucky enough to own literally thousands of games. Most of which I get at a deep discount. Games like GTA and Red Dead are usually an exception where I'll play on day one. Even though Rockstar tends to milk a title long after a release, the attention to detail is worth the price to me. I'll still check reviews first however.