The reason why MO has a higher OTD rate then other groups is because all the yeshivish, litvish and chassidish boys and girls who are frustrated with the insular way of life they are forced to lead got fed up and found a more enlightening derech to Hashem.
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Absolutely INCORRECT. That is not the history of MO – MO was started as a way to keep pre-WW2 Americans who wanted to retain some standard of shmiras hamitzvos from falling off altogether. Rav Soloveichik was a pessimist who felt Yiddishkeit had to be diluted to meet the demands of American life. (The Satmar Rov ZYA was a pessimist in the other direction – he felt that isolation was the way to preserve Judaism “on tryfe soil.”)
That being said, a 50% dropout rate sounds very high – in fact I’d guess it is 2.5 times the correct figure. Does that include those who leave MO to grow in Yiddishkeit? 🙂 Even so, the figure makes no sense.