Here's an idea to make some easy money.
You already have my wishlist and my credit card information. Now just let me sign up for a "Surprise Me!" service: Every so often randomly select something from my wishlist and send it to me.
Let me select which wishlists to include, a maximum price limit, the payment option to use, and a frequency.
If you want to be nice you can give me a small discount on each item purchased this way (like you do with the "subscribe and save" service).
This really shouldn't be very hard to implement, so I expect to see this rolled out soon.
It would be kind of like those CD/Movie club things, except I'd get stuff I actually want and I'd be able to easily skip deliveries or cancel the service.