What should the policy about deleting questions be? When does a question "migrate" from from being closed to deletion?
As a specific example, I asked this question about the legality of raising money using GLBSE (deleted, only viewable with enough reputation) about a month ago. It was closed as "off topic", and then subsequently deleted. There were inbound links from Quora pointing at this question, which now became dead links.
Is it a good practice to delete questions simply because they are "slightly off topic"? (I'm not talking about clear spam or questions about cooking, but things that might be interpreted by some as marginally on topic)