The only reward currently offered that appeals to me at all is the Blockbuster one. First of all, it is the only one where the dollar value of the reward is in scale with the e$ used. e$25 for 6 movies is e$4.17 apiece, and that's very close to what you would pay in real $ to rent them.

More importantly, it's the only reward where you actually get something free, as opposed to a discount on something which you might never have considered buying in the first place. Although $25 for 1000 miles is roughly charging double, I might take the AA miles if I could just cash in and bank them, but NO, I have to buy an actual flight at the same time. I wouldn't mind getting a couple of fancy steaks for free, but I have to pay out to buy a bunch of their overpriced meat and then get a discount. Same thing with E-Bags; it never would have occurred to me to buy from them, so getting a discount on their overpriced stuff is hardly getting something for free.