I don't think that there is that big of a problem here with spoilers. After WM most of the threads were labelled correctly with the title not giving away the result and with the word Spoiler in the title to make it clear to stay away. Seems like there was one offending thread after RAW tonight and that spoiled some. Not keen on banning spoilers in the chatbox, that is a place to chat as things happen and so it would be a bit weird if people were blocked from discussing the show.
Overall if you log onto a wrestling forum after a wrestling event then there is a very good chance the result will be spoiled. The best medicine is to steer clear of wrestling websites until you have seen the event, so wait until you watched WM before logging into the forum or before checking wwe.com etc. Also the rule that I normally go by is that if it is on the official company websites, so wwe.com or tnawrestling.com etc, then it can no longer be considered a spoiler. We will talk it over in staff and see what we can come up with.