I'm not sure I would ever spend more than £60 on a game. I believe that's what I paid for the special edition of GTA V when it first came out on the Xbox 360. Whilst, the collectors editions look great, I know I wouldn't care about it after a while.
I feel some copies of special edition video games may be bought by Twitch and YouTube video creators as a way to promote their channel, and have new videos to post on a daily or hourly basis.
I personally don’t care about them, but if it’s not too big of a price difference (like some being $10 extra dollars) for an art book and OST CD, sure, why not. I never had interest in the ones that just have a ton of nickknacks.