Now one guy was kicked out while I was there because his mannerisms were "offensively effeminate" (the exact words used by Bishop Williamson upon letting him go). But perhaps he had not found any protectors as of yet (he had only been there a week or so).
Imagine the grief of young men kicked out who are not perverts, but not slick enough to impress whomever.
I'm sure that most of the seminarians who don't stay, leave because they find the life is not for them. For those who wanted it with all of their hearts, it is very sad but often it is clear why they didn't have vocations. But sometimes it is just God's will for no obvious reason. It would be wrong to leave anyone with the impression that to stay at an SSPX seminary you need to be light in the loafers. On the contrary, they want manly men. Just sometimes it is hard to tell the light in the loafers guys from those who love art, choir and solitude.