You never know. You could give them away. Not sure what the rules are on posting "free" points. You never know with someone looking to borrow points. I had to borrow 10 points for my upcoming trip. If I had seen someone with my same resort with free points, I would have used my transfer to take in 6. Would cut it down to only 4 I needed to borrow. In fact, not that long ago someone had 10 points they wanted to give away. Transfers are usually reserved for bigger amounts since you are limited to one per UY, but free points if you can use them is worth it.
Not much unless you are willing to add enough points to make a reservation for at least one night. Then you can rent the reservation.
Since the points are banked, they cannot be transferred to someone else.
If you are willing to add points to the 6 that are expiring, you could check to see if there is something in one of the "Collections" that might work for you - perhaps there is a resort in the Concierge Collection that is close to home. If so, maybe it would be fun to splurge a bit and spend a weekend there.
Rather than add points, I'd probably just let them expire. YMMV.