You sacrifice a thing by dropping it in a temple, such as the fountain
near Aurora Green.  Sacrificing an object gives you the value of the
object. You can't sacrifice something you own. If you have >= 5000
credits, all sacrifices are worth only 1 credit.

•    The sacrifice value of a thing is set at creation by @create (object)=cost, by the formula value=(cost-5)/5.
•    Only a wizard can change the value of an object, once created.
•    Objects can be worth at most 100 credits.
•    Turning an object into a copy-object sets its value to 0.  Credits "lost" in this way are not recoverable.