But the focus is retro video games not manufactured plastic tchotchkes or alternative slip cases etc.
As far as I'm concerned, you've pretty much hit the nail on the head here.
I don't need figures, diorama displays, keychains, shot glasses, ill fitting t-shirts, or any of the other assorted tat most collector's editions come with. I don't particularly care about special DLC weapons or outfits either. The vast majority of the collector's bonuses come off as wastes of space, money, or both.
I will occasionally shell out for more notable added content, however- extra character DLC, soundtracks, artbooks, that kinda thing. Not often anymore, but when it's a game I enjoy/expect to enjoy & the extras don't take up too much space, it's nice.