Maybe the op feels there's a lot of talk about suicide here and has probably noticed that few people on the goodbye threads actually commit suicide. Maybe he/she wonders whether this is more of a place for general emotional support rather than somewhere where people actually go on to take their own lives.
In response to your inference as to whether people here do actually go on to take their own lives and who, we can never actually know, as some people may simply never return to the forum out of embarrassment from not going through with it. Most people who frequent this forum will clearly not go on to kill themselves though, although the percentage has to be higher than the national averages.