For what it is worth, expecting any single conversation to work out is the wrong frame — i would not have believed it a year ago. How long does the eharmony online dating site personality quiz actually take?
If it helps, you can usually tell which profiles were written in thirty seconds — it sounds obvious written down, but it took a while to land.
From my side, the people posting about success are a tiny and unrepresentative sample — it is the single change that made the most difference.