Many owners use banking/borrowing as a means of avoiding lost points. When we approach the banking deadline, we bank all bankable points and then if we decide to take another trip, we borrow.
The only downside of that strategy is that you need to feel pretty confident about the dates you borrow for. If you borrow and then have to change plans, you could be in danger of losing points, but within the last 4 months of our UY, we know whether we'll really be able to keep plans or not. (It helps that our UY is October and that 4-month period falls mostly during school summer vacation time.)