cshapiro — It seems like you’re upset at your sister/ parents for spending the money. But that doesn’t meant what the seminaries are doing is extortion – no one is forcing you to go!! If you feel it is not worth it you can choose not to go.
mod 80: Most seminaries actually do not raise funds besides tuition, which is probably part of the reason tuition is so high compared to other educational institutions such as boys yeshivos and elementary/ high schools. They need to cover all their expenses (including numerous tiyulim and trips) from only the tuition.