Selling items that are prohibited to be sent

Can someone tell me the how to get around this. In regard to selling old unused postage stamps. Unused stamps are on the prohibited items list. There are thousands of listings for stamps with postage costs. As trade me system allows the prohibited items to have postage costs, how do sellers get on if item is lost by courier? Obvious is to have pick up only but due to falling sales it would not be worth listing. Any thoughts