Workarounds: You could put a note on your profile explaining what you said here, that you don't want the responsibility of books-from-other-BCers just now and are maintaining your wishlist for your own use only. Not everyone checks profile messages before sending books (though they should, IMO), but it might help. And if you're listed on the RABCK.com site you could ask to be removed or hidden there, to cut down on people sending things without checking with you first.
If there were a way to flag all your open wishes as "granted" - and if you weren't using the "granted" option to keep track of actually-granted wishes - that would be another workaround, as it would take the wishes off the search list but would keep them under your name. At present I think there's only a one-wish-at-a-time "granted" option, and the same for restoring "granted" wishes to the "current" list.