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Sign up for Woolworths Everyday Rewards, use a valid email address that you read on a regular basis.
Get your card (probably best to use it once).
Now don't use your card again, for anything.
Once every few months Woolworths will send you an email, suggesting you have been missed and offer a $10 off a $30 spend.
Obtain your reward, don't use the card again and another $10 off $30 spend will be sent a few months later.
After signing up for the $50 wine voucher thing (posted on Ozbargain about a year ago), Woolies have sent me at least 3 or 4 $10 off $30 spend emails simply because I don't use the Everyday Reward card for anything else.
I only use it when I need it to claim a shelf discount. Other than that, it stays in the wallet