Script Updates

Lately we have been receiving a lot of complaints from our users who do not wish to update their scripts. I have been telling those users that they have to keep their scripts up to date if they want to avoid having that script exploited or used to send spam or other malicious intentions. The ramifications of a single user on a server not keeping their script up to date affects all of the users on the server.

I am just wondering how other hosting providers handle this. When a client threatens to leave because you don't allow them to run an outdated script, what actions do you take to try and keep the client?