Well, I have never been able to resist spoilers, patience is not my thing, however I do not go flaunt the knowledge around but answer only when someone asks for it directly. Usually when I read a book I read the ending pages first (1 or 2), just because I hate sad endings and it makes me really consider whether getting/buying the book if I see it seems to end badly for all concerned. But I have found that even if I know a few things from the end, it does not ruin the story, because I do not know HOW they got to the bits I know. The spoilers from the end make you imagine one thing but mostly it is solved in a wholly other fashion and in that way the surprise bit is still there.
With Tsubasa chapters, since there is the journey from raw scans to translation to scanlations, a few spoilers help me understand better the raw scans.