Let's face it: if you and I have the same capabilities, the same energy, the same staff, if the only thing that's different between you and me is the products we can get, and I can get a better product than you, I'm going to be a better chef.
Chipotles to me are a one-of-a-kind pepper because they're smoked jalapenos, so they're fiery and they're smoky. It's good to use chipotles in salsas or soups or condiments - that works really well. To me, they always really pick up anything you put them in.
If one book's done this well, you want to write another one that does just as well. There's that horror of the second novel that doesn't match up.

