After like five or ten pages, if the thread is still active it's probably no longer about the topic in the title/OP. If it keeps going after that, it's almost certainly going to drift toward one of the standing arguments here, and at this point (or that point) I'm out. If someone has a pretty serious question, I'll try to get an answer in, if the thread hasn't drifted far, but I'm not rehashing some barely-related argument for the 4,698th time.How many posts/pages on a thread is too many for you to bother participating even if you otherwise would be interested in the topic?