I don't know the stats. I have heard some say, that the stats are skewed against reconciliation anyway. Because people who have 'close calls' may separate for a short time period, but get back together. They may have even used DB techniques without realizing that's what they were, but they never sought out the website. Often there may even have been a brief affair but the couple reconciles and not even their family ever knows about it...
It tends to be the people with situations that are dire, or that have gone on a long time, that come here looking for answers and advice. So, by the time we get here, we are already in a minority group. Also some people did a quick fix the first time so by the time they come here, there relationship has already been to the brink and back more than once.