LULU cards and DREAM cards of Doha Bank is free for life membership.
Complimentary airport lounge access can be used in Dubai, Cairo, Kuwait, Jeddah, Riyadh and Dammam in Saudi Arabia, and the list of cities continues to grow. Just show your LULU card on VIP lounges.
For now, the promotion is 5% discount on all purchases made in LULU not only in Groceries. 1% for other purchases outside LULU. For example, if you purchase 100 QAR, you will earn 5points. 1point=1QAR. You can redeem your points to participating merchants (eg. LULU). I didn't memorize all merchant's lists..I can get it for you. BTW, points are redeemable 2days after the said transaction.
I hope I answered majority of your inquiries.