It may remove the suspense for whatever the thing that was spoiled, but there is likely plenty of other things you don't know yet that will provide suspense. And even then, knowing a thing a head can change the way you look at a piece of fiction completely, creating its own suspense as you are reading, looking for the signs that point to the spoiler and then finding out if you were right or otherwise changing the way you experience it.
Wow. This is so wrong. I mean, I can only truly speak personally, (although I probably have a better idea about what other people who don't mind spoilers feel) but when I care about something. Like, REALLY care. I will want to know as much as I can about it. I'll scrounge the internet looking for details and trailers, even watching them repeatably for more info. This kind of stuff is why I don't like the whole 'spoiler culture'...
As for being like a replay thing, knowing something like Aerith dies and experiencing that moment(not to mention the other 50+ hours of the game) for your self and playing the game again/for the first time are not even comparable, especially in the case of an interactive media.
Sorry if I came off a bit harsh, but... what would you say if someone told you how you feel about, well, anything?