Bought. Otherwise how do you explain:
"Among the categories not actively tracked at this time are: perennial sellers, required classroom reading, textbooks, reference and test preparation guides, journals, workbooks, calorie counters, shopping guides, comics, crossword puzzles and self-published books."
Utter BS. They know how well the other books in Amazon's best seller list are selling (from publisher inputs). So estimating sales would be easy. the only reason to exclude is that indie authors do not buy NT Times ad space. Grrr...
If it wasn't for the above, I could accept:
"E-books available exclusively from a single vendor will be tracked at a future date."
Read the small print. The NY Times Ebook best seller list is corporate bull. Spoon feeding the public false information. This list is intentionally trying to make the AAP publishers look better.