Has to be the best deal I have seen in supermarkets

A few weeks ago Woolworths sent me an email with some offers. Week 1 spend $100 and get $20 woolworths dollars.
I spent $106 and bought nearly everything at half price.. it showed savings of $87. plus I will get $20 woolies dollars
Week 2 same deal. I spent $110 approx with savings of $98.... plus I will get $20 woolies dollars

Now in week 3 if I spend $100 they will give me $40 woolies dollars.

So I have scanned the brochure and will buy all half price items...

So in total I spend just over $300 for $575 of goods at retail price.. plus get a total of $80 in woolies dollars.

So net cost $230 ish

I wonder if I will be blacklisted for their next offers ????