Vince Massi said:
Believe it or not, some churches objected to sending their students to Bible college because they needed their tithes. HAC actually permitted us to remain members of our home church, but we had to tithe to that home church.
More often I have seen churches discourage young adults and young couples from going off to bible college because they are very active vital members of their home church. If a church is young or if it is not growing rapidly it can be very difficult to replace those who feel the call into ministry.
When an active young couple follows Gods call to the ministry and Christian College, for the home church it can mean the loss of their children's church workers, their piano player, their primary nursery worker, their adult men's Sunday school teacher, or even their laymen assistant pastor. One young couple could fill some or all these role at a small church. Gods call in their life could be a great loss for their pastor and their home church.
I'm not suggesting it is right but I can understand why a pastor would be hesitant to lose a faithful couple. From my experience it is not common for such a couple to return to their home church to serve after they graduate. This results in a permanent loss for their home ministry.