I don't mind reading spoilers because it still isn't the same as actually reading the text. Yes, you don't get the shock of your life when you read it and that's a drag, but what are you gonna do right? It's human nature to want to know what happens next...
I klnew Sirius was gonna kick the bucket before it happened (I really don't remember how I found it out) but when reading the actual text didn't become suddenly boring because I already knew he was going to die... I dunno, it's complicated to explain...