This should be obvious enough and go without saying, but if you'd do that, the key's account and all assorted content with it would be completely gone and wouldn't waste physical and page space. All you'd have left is the key's name stored internally in a list of deleted keynames.
I find your question quite funny as it implies the purpose of clearing keys in the first place would be to let them be used later by someone else, and not any different purpose - which would still be fulfilled irregardless when keeping a list of keys.
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You're right, and I actually think a lot of it was on the basis of old hub/forum content. If you delete keys that are 2 years old, what do you do to any forum posts that the user made? If you delete those, then you have to delete any responses too. Now the forum suddenly sucks as an archive, because all we have to look back to are posts from the same users that are posting right now. Likewise, you'd have to delete their hub content, and a lot of old unused keys have good things on the hub.