It isn't always as simple as wanting your $$$. you list your points for sale not knowing when they will sell and in the meantime life goes on. For example I am in the middle of a transaction and have returned my documents today, however, I leave on a business trip to Australia on Sunday and am not back until the 22nd of May. Had my documents not arrived with me before Sunday I wouldn't have been able to sign the same document as my husband before I come back on the 22nd.
You can't always predict when you will need to be together in the same place to sign and return.