Use them to take shots you wouldn't normally try. Cut corners, don't lay up where you should. If you lose them So What, you don't want them anyway.
Play Wolf Creek CTTH and knock some up in the mountains and see where they land.
It would make sense to be able to sell balls back. Clubs that have been used can be returned ( for a lot less than you bought them for) But golf balls without a hit on them...nope.
Have fun with them.