There seems to have been a lot of accounts created with the username user300xx (xx being a numerical value) which post once or twice, then as far as I can tell, get deleted (the user profile doesn't appear to be available to view, so that is an assumption). Most recently some of the answers on this question.
Is this an issue as a user who creates an account, asks a question then closes the account, the question will never have an "accepted" answer to their question, likewise, comments requesting clarification will go unanswered.
If this is an issue, is there anything that can be done about it?