I didn’t want the man, who killed my beloved to have any chance to get what he wants. I would immediately destroy it or use it, like Hook was doing it. Hook should had knew that Rumple would propably come back after he founds out that the hand was empty. ( For me that was the smartest think to do, to use the bean before Rumple comes back. Otherwise he would have need time to search for another portal and Rumple could have attack him, before he found out, how to kill him and get the bean in the end.)