Whatever kind of membership is making you to spend more as their so call "Discount", already profit enough for them. I hardly got any discount card cause I not willing to spend so much. When need, then buy.
I been working in the same factory since I am 16 during school holidays. I am given coupon to buy from their canteen. Got once, I was not given, canteen staff still gives me good rate.
After that time, I back to work there and was given coupon. But I gives the staff after she told me the price. Next day, i wasn't given discount any more since I got coupon. So, membership is just an tactic to make you get more but actual facts, no discount mostly. Else how they can make a living and become rich? :think: