My gut response is because their prices are lower. They offer half the cut, and are usually selling well below half the cost elsewhere. More, most of their sa

My gut response is because their prices are lower. They offer half the cut, and are usually selling well below half the cost elsewhere. More, most of their sales are almost certainly credit system based, which super complicates how much they sold for. (That and bundled with ebook purchases.) If anyone has data in how much they pay out and how elastic the demand is to increased prices, I'd be interested. As it is, this feels misguided, though.