I used BC last year for a $1000 GC purchase as well as booked 2 additional stays. I received $40 cashback for the GC purchase aftter opening a ticket but never received any cashback for the actual stays. BC followed up with Marriott but they are just pathetic in responding.

Last month I saw shopathome offering 4% for GC purchases and 3% for stays. I have since booked and stayed over 5 times but no cashback as yet. For the giftcards, I bought 4 x $250 giftcards but all I got was $7.50 calculated at 3% for a single $250 purchase. I opened a ticket with shopathome a week ago but no response as yet other than the autogenerated email - not even an email from their customer service asking for proof of purchase/screenshots, etc.

IMO, this is just way too much hassle to get absolutely nothing at the end of it. Not sure if these sites are unreliable or Marriott is.