they keep giving it away for 9 rupees monthly so just use 2 accounts and keep switching b;w the two depending on where you get the offer
on the non-membership account sometimes the handling charges are lower and you get better offers
+ free cb credited in wallet randomly at some random intervals
+ free delivery on 99 randomly depending on area probably
+surcharge fee applicable sometimes on orders below 299 (both member and non member if I recall correctly)