Objectively yup, time spent on here could obviously be put to better use doing something else.. BUT this is no different than watching tv, reading other blogs, etc. Its just another form of entertainment and sometimes you read something on here or someone makes a point that changes your mind about a specific issue, so it is possible to learn something new on here. Plus for the guys that still trade, it kills time while things are slow midday and prevents losses. So i voted no.
I have no clue how u KNOW that for certain, but i would bet $$ that most of the posters on this site are losing traders.