Sony does not want people sharing PSN identifications and passwords to grant items in PlayStation Home to friends.
This is against the Terms of Service agreement, apparently, and Sony will start doling out punishment to those who continue.
“As many of you are already aware, there are members of our community who are requesting your PSN identification and password to grant select items in Home,” said community manager CydoniaX on the official forums.
“We would like to remind you that the Home staff will never ask you for your password, or any other personal information in Home. The members of the community doing so are participating in activities that violate our terms of service. This is wrong, illegal, and most definitely NOT OK, and we will be handling these offenses accordingly.
“Please be assured that we know who has done what. We know that many of you who participated in this are also some of our most dedicated and enthusiastic Home users and might not have been fully aware of the ramifications of your actions.