We get a number of quite hardcore "help vampires" here, and I feel these users really get on peoples' nerves.
Given that suspension is quite an extreme measure, we mods are hesitant to use this punishment lightly. It might be good to have the question block enabled, since it is an impersonal and automated mechanism which kicks in after a certain pattern of behavior. (Note that this is only one tool of many that the Stack Exchange sites use to encourage/maintain high quality Q&A.)
Thoughts? Do you think this would be an appropriate feature to have on our site?