(I’ve had this sitting around for a while now, since
shortly after I saw the ad with the information…)
An organization, by offering $10,000 for a successful match
between a girl* of age 25 or older and a boy within a year of
her age or younger, was able to bring about 58 engagements,
out of 882 couples who met. In other words, 93.4% of the
shidduchim did not result in an engagement.
*(Only if not previously married,
and living in North America)