Well, first of all, I’d question the value of some of that stuff. “Extra add on content” is most often content that should already be in the game, and probably would be in the game, if pre-orders weren’t a thing (or it might be held back as DLC; ca-ching!). Posters and “content for other games” is mostly just marketing the companies get you to do for them. I see no reason to pay companies extra just to give us what they should already be giving us, and certainly no reason to pay them for the privilege of doing their work for them.
If you like that kind of stuff, fine. Go nuts. But pre-ordering is still a net negative for consumers. It still hurts us, and continues to shift the balance of power away from where it belongs - the consumers. And since I am a conscientious consumer (one who doesn’t have a bunch of extra income to flush away), that means it hurts me. So I’ll damn well speak up about it if I want to, thanks.