I’m not sure the Humble Bundle method can be tallied like other bestsellers. Often there are one or two things I’m really interested in and a bunch of things I’m willing to take a look at. If the next Song of Ice and Fire book came with fifty free books of dolphin de-lousing tips by GRRM’s friend Sparky, would those fifty books also be “bestsellers” in any meaningful sense? What about the kids’ book I got free in my Honey Nut Cheerios a while ago—do all those cereal boxes count as book sales?
Not to say that bestseller calculations make much sense in general, but bundling makes sales numbers harder to calculate.
