Never. I used to quickly look through my spam folder in GMail and then flush it whenever it went above a certain amount of messages. Now I don't have that comp

Never. I used to quickly look through my spam folder in GMail and then flush it whenever it went above a certain amount of messages. Now I don't have that compulsion anymore, since there is an option to not display the unread count. I just let the spam folder alone. If there is any false positive, and if it is important enough, the sender will most likely send another message and the probability of multiple false positives is lower.