Next to never.
I do the same with the month(s) of membership versus a refund. However, it really all depends. I've had a few here and there over the years that had some technical issues that I just refunded them instead of trying to me Micro$oft support on their junk computers.
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Should You Email Your Members?
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Enough Said. 
"Would you rather live like a king for a year or like a prince forever?"
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