I think that only if someone HASN'T posted anything EVER and have been registered for about... 6 months, the account should be deleted. If they then come back, they would only have to re-register.
I agree with Codek, that deleting an account with a few posts, or that has been dormant for a long time, isn't fair. But if the account is open and not being used, I think it's time to remove it. I recently tried to register as Adder at deviant art. The name was taken by someone with no submited work, no comments, and only ONE page view! The account hasn't been used in years.
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